Otto von Bismarck

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Otto, Prince of Bismarck, Count of Bismarck-Schönhausen, Duke of Lauenburg (German: Otto Fürst von Bismarck, Graf von Bismarck-Schönhausen, Herzog zu Lauenburg, [ˈɔtoː fɔn ˈbɪsmaʁk](listen); 1 April 1815 – 30 July 1898), born Otto Eduard Leopold von Bismarck, was a conservative German statesman and diplomat. From his base in the upper class of Junker landowners, Bismarck rose rapidly in Prussian politics. He masterminded the unification of Germany in 1871 and served as its first chancellor until 1890, in which capacity he dominated European affairs for two decades. He had served as the chancellor of the North German Confederation from 1867 to 1871 and alongside the office of chancellor of Germany, he was Prussia's minister president and the minister of Foreign Affairs from 1862 to 1890. Before his rise to the executive power, Bismarck was the Prussian ambassador to Russia and France and served in both houses of the Prussian Parliament. He cooperated with King Wilhelm I of Prussia to unify the various German states, a partnership that would last for the rest of Wilhelm's life. King Wilhelm granted Chancellor Bismarck the titles of Count of Bismarck-Schönhausen in 1865 and Prince of Bismarck in 1871. Bismarck provoked three short, decisive wars against Denmark, Austria, and France. Following the victory against Austria, he abolished the supranational German Confederation and instead formed the North German Confederation as the first German national state, aligning the smaller North German states behind Prussia, and excluding Austria. Receiving the support of the independent South German states in the Confederation's defeat of France, he formed the German Empire – which also excluded Austria – and united Germany.

With Prussian dominance accomplished by 1871, Bismarck skillfully used balance of power diplomacy to maintain Germany's position in a peaceful Europe. To historian Eric Hobsbawm, Bismarck "remained undisputed world champion at the game of multilateral diplomatic chess for almost twenty years after 1871, [and] devoted himself exclusively, and successfully, to maintaining peace between the powers". However, his annexation of Alsace–Lorraine gave new fuel to French revanchism and Germanophobia. Bismarck's diplomacy of Realpolitik and powerful rule at home gained him the nickname the Iron Chancellor. German unification and its rapid economic growth was the foundation to his foreign policy. He disliked colonialism but reluctantly built an overseas empire when it was demanded by both elite and mass opinion. Juggling a very complex interlocking series of conferences, negotiations and alliances, he used his diplomatic skills to maintain Germany's position.

A master of complex politics at home, Bismarck created the first welfare state in the modern world, with the goal of gaining working class support that might otherwise go to his Socialist opponents. In the 1870s, he allied himself with the low-tariff, anti-Catholic Liberals and fought the Catholic Church in what was called the Kulturkampf ("culture struggle"). He lost that battle as the Catholics responded by forming the powerful German Centre Party and using universal male suffrage to gain a bloc of seats. Bismarck then reversed himself, ended the Kulturkampf, broke with the Liberals, imposed protective tariffs, and formed a political alliance with the Centre Party to fight the Socialists. A devout Lutheran, he was loyal to his ruler, Kaiser Wilhelm I, who argued with Bismarck but in the end supported him against the advice of his wife Empress Augusta and his heir Crown Prince Frederick William. While Germany's parliament was elected by universal male suffrage, it did not have much control of government policy. Bismarck distrusted democracy and ruled through a strong, well-trained bureaucracy with power in the hands of a traditional Junker elite that consisted of the landed nobility in eastern Prussia. In his role as chancellor, he largely controlled domestic and foreign affairs. The year 1888 saw a quick transition on the German throne from Wilhelm I to his son Frederick III to Frederick's son Wilhelm II. The headstrong Kaiser Wilhelm II dismissed Bismarck from office. He retired to write his memoirs.

Bismarck was strong-willed, outspoken and overbearing, but he could also be polite, charming and witty. Occasionally he displayed a violent temper – which he sometimes feigned to get the results he wanted – and he kept his power by melodramatically threatening resignation time and again, which cowed Wilhelm I. He possessed not only a long-term national and international vision but also the short-term ability to juggle complex developments. Bismarck became a hero to German nationalists; they built many monuments honoring the founder of the new Reich. Many historians praise him as a visionary who was instrumental in uniting Germany and, once that had been accomplished, kept the peace in Europe through adroit diplomacy. Historian Robert K. Massie has noted Bismarck's popular image was as "gruff" and "militaristic", while in reality "Bismarck's tool was aggressive, ruthless diplomacy."

Bismarck in 1836, at age 21

Bismarck was born in 1815 at Schönhausen, a noble family estate west of Berlin in the Prussian province of Saxony. His father, Karl Wilhelm Ferdinand von Bismarck (1771–1845), was a Junker estate owner and a former Prussian military officer; his mother, Wilhelmine Luise Mencken (1789–1839), was the well-educated daughter of a senior government official in Berlin. In 1816, the family moved to its Pomeranian estate, Kniephof (now Konarzewo, Poland), northeast of Stettin (now Szczecin), in the then-Prussian province of Further Pomerania. There, Bismarck spent his childhood in a bucolic setting.

Bismarck had two siblings: his older brother Bernhard (1810–1893) and his younger sister Malwine (1827–1908). The world saw Bismarck as a typical backwoods Prussian Junker, an image that he encouraged by wearing military uniforms. However, he was well educated and cosmopolitan with a gift for conversation, and knew English, French, Italian, Polish and Russian.

Bismarck was educated at Johann Ernst Plamann's elementary school, and the Friedrich-Wilhelm and Graues Kloster secondary schools. From 1832 to 1833, he studied law at the University of Göttingen, where he was a member of the Corps Hannovera, and then enrolled at the University of Berlin (1833–35). In 1838, while stationed as an army reservist in Greifswald, he studied agriculture at the University of Greifswald. At Göttingen, Bismarck befriended the American student John Lothrop Motley. Motley, who later became an eminent historian and diplomat while remaining close to Bismarck, wrote a novel in 1839, Morton's Hope, or the Memoirs of a Provincial, about life in a German university. In it he described Bismarck as a reckless and dashing eccentric, but also as an extremely gifted and charming young man.

Although Bismarck hoped to become a diplomat, he started his practical training as a lawyer in Aachen and Potsdam, and soon resigned, having first placed his career in jeopardy by taking unauthorized leave to pursue two English girls: first Laura Russell, niece of the Duke of Cleveland, and then Isabella Loraine-Smith, daughter of a wealthy clergyman. In 1838 Bismarck began a shortened compulsory military service in the Prussian Army; actively serving as a One-year volunteer before becoming an officer in the Landwehr (reserve). Afterwards he returned to run the family estates at Schönhausen on his mother's death in his mid-twenties.

Around age 30, Bismarck formed an intense friendship with Marie von Thadden [de], newly married to one of his friends, Moritz von Blanckenburg [de]. A month after her death, Bismarck wrote to ask for the hand in marriage of Marie's cousin, the noblewoman Johanna von Puttkamer (1824–94); they were married at Alt-Kolziglow (modern Kołczygłowy) on 28 July 1847. Their long and happy marriage produced three children: Marie (b. 1847), Herbert (b. 1849) and Wilhelm (b. 1852). Johanna was a shy, retiring and deeply religious woman, although famed for her sharp tongue in later life.

Young politician

In 1847, Bismarck, aged thirty-two, was chosen as a representative to the newly created Prussian legislature, the Vereinigter Landtag. There, he gained a reputation as a royalist and reactionary politician with a gift for stinging rhetoric; he openly advocated the idea that the monarch had a divine right to rule. His selection was arranged by the Gerlach brothers, fellow Pietist Lutherans whose ultra-conservative faction was known as the "Kreuzzeitung" after their newspaper, the Neue Preußische Zeitung, which was so nicknamed because it featured an Iron Cross on its cover.

Bismarck in 1847, at age 32

In March 1848, Prussia faced a revolution (one of the revolutions of 1848 across Europe), which completely overwhelmed King Frederick William IV. The monarch, though initially inclined to use armed forces to suppress the rebellion, ultimately declined to leave Berlin for the safety of military headquarters at Potsdam. Bismarck later recorded that there had been a "rattling of sabres in their scabbards" from Prussian officers when they learned that the King would not suppress the revolution by force. He offered numerous concessions to the liberals: he wore the black-red-gold revolutionary colours (as seen on the flag of today's Germany), promised to promulgate a constitution, agreed that Prussia and other German states should merge into a single nation-state, and appointed a liberal, Gottfried Ludolf Camphausen, as Minister President.

Bismarck had at first tried to rouse the peasants of his estate into an army to march on Berlin in the King's name. He travelled to Berlin in disguise to offer his services, but was instead told to make himself useful by arranging food supplies for the Army from his estates in case they were needed. The King's brother, Prince Wilhelm, had fled to England; Bismarck tried to get Wilhelm's wife Augusta to place their teenage son Frederick William on the Prussian throne in Frederick William IV's place. Augusta would have none of it, and detested Bismarck thereafter, despite the fact that he later helped restore a working relationship between Wilhelm and his brother the King. Bismarck was not yet a member of the Landtag, the lower house of the new Prussian legislature. The liberal movement perished by the end of 1848 amid internal fighting. Meanwhile, the conservatives regrouped, formed an inner group of advisers—including the Gerlach brothers, known as the "Camarilla"—around the King, and retook control of Berlin. Although a constitution was granted, its provisions fell far short of the demands of the revolutionaries.

In 1849, Bismarck was elected to the Landtag. At this stage in his career, he opposed the unification of Germany, arguing that Prussia would lose its independence in the process. He accepted his appointment as one of Prussia's representatives at the Erfurt Parliament, an assembly of German states that met to discuss plans for union, but he only did so to oppose that body's proposals more effectively. The parliament failed to bring about unification, for it lacked the support of the two most important German states, Prussia and Austria. In September 1850, after a dispute over Hesse (the Hesse Crisis of 1850), Prussia was humiliated and forced to back down by Austria (supported by Russia) in the so-called Punctation of Olmütz; a plan for the unification of Germany under Prussian leadership, proposed by Prussia's Minister President Radowitz, was also abandoned.

In 1851, Frederick William IV appointed Bismarck as Prussia's envoy to the Diet of the German Confederation in Frankfurt. Bismarck gave up his elected seat in the Landtag, but was appointed to the Prussian House of Lords a few years later. In Frankfurt he engaged in a battle of wills with the Austrian representative Count Friedrich von Thun und Hohenstein. He insisted on being treated as an equal by petty tactics such as imitating Thun when Thun claimed the privileges of smoking and removing his jacket in meetings. This episode was the background for an altercation in the Frankfurt chamber with Georg von Vincke that led to a duel between Bismarck and Vincke with Carl von Bodelschwingh as an impartial party, which ended without injury.

Bismarck's eight years in Frankfurt were marked by changes in his political opinions, detailed in the numerous lengthy memoranda, which he sent to his ministerial superiors in Berlin. No longer under the influence of his ultraconservative Prussian friends, Bismarck became less reactionary and more pragmatic. He became convinced that to countervail Austria's newly restored influence, Prussia would have to ally herself with other German states. As a result, he grew to be more accepting of the notion of a united German nation. He gradually came to believe that he and his fellow conservatives had to take the lead in creating a unified nation to keep from being eclipsed. He also believed that the middle-class liberals wanted a unified Germany more than they wanted to break the grip of the traditional forces over society.

Bismarck also worked to maintain the friendship of Russia and a working relationship with Napoleon III's France, the latter being anathema to his conservative friends, the Gerlachs, but necessary both to threaten Austria and to prevent France allying with Russia. In a famous letter to Leopold von Gerlach, Bismarck wrote that it was foolish to play chess having first put 16 of the 64 squares out of bounds. This observation became ironic, as after 1871, France indeed became Germany's permanent enemy, and eventually allied with Russia against Germany in the 1890s.

Bismarck was alarmed by Prussia's isolation during the Crimean War of the mid-1850s, in which Austria sided with Britain and France against Russia; Prussia was almost not invited to the peace talks in Paris. In the Eastern Crisis of the 1870s, fear of a repetition of this turn of events would later be a factor in Bismarck's signing the Dual Alliance with Austria-Hungary in 1879.

Ambassador to Russia and France

In October 1857, Frederick William IV suffered a paralysingstroke, and his brother Wilhelm took over the Prussian government as Regent. Wilhelm was initially seen as a moderate ruler, whose friendship with liberal Britain was symbolised by the recent marriage of his son Frederick William to Queen Victoria's eldest daughter. As part of his "New Course", Wilhelm brought in new ministers, moderate conservatives known as the Wochenblatt after their newspaper.

Bismarck in 1863 with Roon (centre) and Moltke (right), the three leaders of Prussia in the 1860s

The Regent soon replaced Bismarck as envoy in Frankfurt and made him Prussia's ambassador to the Russian Empire. In theory, this was a promotion, as Russia was one of Prussia's two most powerful neighbors. But Bismarck was sidelined from events in Germany and could only watch impotently as France drove Austria out of Lombardy during the Italian War of 1859. Bismarck proposed that Prussia should exploit Austria's weakness to move her frontiers "as far south as Lake Constance" on the Swiss border; instead, Prussia mobilised troops in the Rhineland to deter further French advances into Venetia.

Bismarck stayed in St Petersburg for four years, during which he almost lost his leg to botched medical treatment and once again met his future adversary, the Russian Prince Gorchakov, who had been the Russian representative in Frankfurt in the early 1850s. The Regent also appointed Helmuth von Moltke as the new Chief of Staff of the Prussian Army, and Albrecht von Roon as Minister of War with the job of reorganizing the army. Over the next twelve years, Bismarck, Moltke and Roon transformed Prussia.

Despite his lengthy stay abroad, Bismarck was not entirely detached from German domestic affairs. He remained well-informed due to Roon, with whom Bismarck formed a lasting friendship and political alliance. In May 1862, he was sent to Paris to serve as ambassador to France, and also visited England that summer. These visits enabled him to meet and take the measure of several adversaries: Napoleon III in France, and in Britain, Prime Minister Palmerston, Foreign Secretary Earl Russell, and Conservative politician Benjamin Disraeli.

Otto von Bismarck as Minister President of Prussia, shown wearing insignia of a knight of the Johanniterorden, 1858

Prince Wilhelm became King of Prussia upon his brother Frederick Wilhelm IV's death in 1861. The new monarch often came into conflict with the increasingly liberal Prussian Diet (Landtag). A crisis arose in 1862, when the Diet refused to authorize funding for a proposed re-organization of the army. The King's ministers could not convince legislators to pass the budget, and the King was unwilling to make concessions. Wilhelm threatened to abdicate in favour of his son Crown Prince Frederick William, who opposed his doing so, believing that Bismarck was the only politician capable of handling the crisis. However, Wilhelm was ambivalent about appointing a person who demanded unfettered control over foreign affairs. It was in September 1862, when the Abgeordnetenhaus (House of Deputies) overwhelmingly rejected the proposed budget, that Wilhelm was persuaded to recall Bismarck to Prussia on the advice of Roon. On 23 September 1862, Wilhelm appointed Bismarck Minister President and Foreign Minister.

Bismarck, Roon and Moltke took charge at a time when relations among the Great Powers (Great Britain, France, Austria and Russia) had been shattered by the Crimean War and the First Italian War of Independence. In the midst of this disarray, the European balance of power was restructured with the creation of the German Empire as the dominant power in continental Europe apart from Russia. This was achieved by Bismarck's diplomacy, Roon's reorganization of the army and Moltke's military strategy.

Despite the initial distrust of the King and Crown Prince and the loathing of Queen Augusta, Bismarck soon acquired a powerful hold over the King by force of personality and powers of persuasion. Bismarck was intent on maintaining royal supremacy by ending the budget deadlock in the King's favour, even if he had to use extralegal means to do so. Under the Constitution, the budget could be passed only after the king and legislature agreed on its terms. Bismarck contended that since the Constitution did not provide for cases in which legislators failed to approve a budget, there was a "legal loophole" in the Constitution and so he could apply the previous year's budget to keep the government running. Thus, on the basis of the 1861 budget, tax collection continued for four years.

Bismarck's conflict with the legislators intensified in the coming years. Following the Alvensleben Convention of 1863, the House of Deputies resolved that it could no longer come to terms with Bismarck; in response, the King dissolved the Diet, accusing it of trying to obtain unconstitutional control over the ministry—which, under the Constitution, was responsible solely to the king. Bismarck then issued an edict restricting the freedom of the press, an edict that even gained the public opposition of the Crown Prince. Despite (or perhaps because of) his attempts to silence critics, Bismarck remained a largely unpopular politician. His supporters fared poorly in the elections of October 1863, in which a liberal coalition, whose primary member was the Progress Party, won over two-thirds of the seats. The House made repeated calls for Bismarck to be dismissed, but the King supported him, fearing that if he did dismiss the Minister President, he would most likely be succeeded by a liberal.

Blood and Iron speech

German unification had been a major objective of the revolutions of 1848, when representatives of the German states met in Frankfurt and drafted a constitution, creating a federal union with a national parliament to be elected by universal male suffrage. In April 1849, the Frankfurt Parliament offered the title of Emperor to King Frederick William IV. Fearing the opposition of the other German princes and the military intervention of Austria and Russia, the King renounced this popular mandate, citing his concerns over the legitimacy of the parliament to offer him the crown without the consent of the varing German rulers. Thus, the Frankfurt Parliament ended in failure for the German liberals. On 30 September 1862, Bismarck made a famous speech to the Budget Committee of the Prussian Chamber of Deputies in which he expounded on the use of "iron and blood" to achieve Prussia's goals:

Prussia must concentrate and maintain its power for the favorable moment which has already slipped by several times. Prussia's boundaries according to the Vienna treaties are not favorable to a healthy state life. The great questions of the time will not be resolved by speeches and majority decisions – that was the great mistake of 1848 and 1849 – but by iron and blood.

Defeat of Denmark

Prior to the 1860s, Germany consisted of a multitude of principalities loosely bound together as members of the German Confederation. Bismarck used both diplomacy and the Prussian military to achieve unification, excluding Austria from a unified Germany. This made Prussia the most powerful and dominant component of the new Germany, but also ensured that it remained an authoritarian state and not a liberal parliamentary democracy.

Bismarck faced a diplomatic crisis when King Frederick VII of Denmark died in November 1863. The succession to the duchies of Schleswig and Holstein was disputed; they were claimed by Christian IX, Frederick VII's heir as King, and also by Frederick von Augustenburg, a Danish duke. Prussian public opinion strongly favoured Augustenburg's claim, as the populations of Holstein and southern Schleswig were primarily German-speaking. Bismarck took an unpopular step by insisting that the territories legally belonged to the Danish monarch under the London Protocol signed a decade earlier. Nonetheless, Bismarck denounced Christian's decision to completely annex Schleswig to Denmark. With support from Austria, he issued an ultimatum for Christian IX to return Schleswig to its former status. When Denmark refused, Austria and Prussia invaded, sparking the Second Schleswig War. Denmark was ultimately forced to renounce its claim on both duchies.

At first this seemed like a victory for Augustenburg, but Bismarck soon removed him from power by making a series of unworkable demands, namely that Prussia should have control over the army and navy of the duchies. Originally, it had been proposed that the Diet of the German Confederation, in which all the states of Germany were represented, should determine the fate of the duchies; but before this scheme could be effected, Bismarck induced Austria to agree to the Gastein Convention. Under this agreement signed on 20 August 1865, Prussia received Schleswig, while Austria received Holstein. In that year Bismarck was given the title of Count (Graf) of Bismarck-Schönhausen.

Defeat of Austria

In 1866, Austria reneged on the agreement and demanded that the Diet determine the Schleswig–Holstein issue. Bismarck used this as an excuse to start a war with Austria by accusing them of violating the Gastein Convention. Bismarck sent Prussian troops to occupy Holstein. Provoked, Austria called for the aid of other German states, who quickly became involved in the Austro-Prussian War. Thanks to Roon's reorganization, the Prussian army was nearly equal in numbers to the Austrian army. With the strategic genius of Moltke, the Prussian army fought battles it was able to win. Bismarck had also made a secret alliance with Italy, who desired Austrian-controlled Veneto. Italy's entry into the war forced the Austrians to divide their forces.

Meanwhile, as the war began, a German radical named Ferdinand Cohen-Blind attempted to assassinate Bismarck in Berlin, shooting him five times at close range. Bismarck had only minor injuries. Cohen-Blind later committed suicide while in custody.

Cartoon from 1867 making fun of Bismarck's different roles, from general to minister of foreign affairs, federal chancellor, hunter, diplomat and president of the parliament of the Zollverein, the Prussian-dominated German customs union

The war lasted seven weeks. Austria had a seemingly powerful army that was allied with most of the north German and all of the south German states. Nevertheless, Prussia won the decisive Battle of Königgrätz. The King and his generals wanted to push onward, conquer Bohemia and march to Vienna, but Bismarck, worried that Prussian military luck might change or that France might intervene on Austria's side, enlisted the help of Crown Prince Frederick Wilhelm, who had opposed the war but had commanded one of the Prussian armies at Königgrätz, to dissuade his father after stormy arguments. Bismarck insisted on a "soft peace" with no annexations and no victory parades, so as to be able to quickly restore friendly relations with Austria.

As a result of the Peace of Prague (1866), the German Confederation was dissolved. Prussia annexed Schleswig, Holstein, Frankfurt, Hanover, Hesse-Kassel, and Nassau. Furthermore, Austria had to promise not to intervene in German affairs. To solidify Prussian hegemony, Prussia forced the 21 states north of the River Main to join it in forming the North German Confederation in 1867. The confederation was governed by a constitution largely drafted by Bismarck. Executive power was vested in a president, an hereditary office of the kings of Prussia, who was assisted by a chancellor responsible only to him. As president of the confederation, Wilhelm appointed Bismarck as chancellor of the confederation. Legislation was the responsibility of the Reichstag, a popularly elected body, and the Bundesrat, an advisory body representing the states. The Bundesrat was, in practice, the stronger chamber. Bismarck was the dominant figure in the new arrangement; as Foreign Minister of Prussia, he instructed the Prussian deputies to the Bundesrat.

Prussia had only a plurality (17 out of 43 seats) in the Bundesrat despite being larger than the other 21 states combined, but Bismarck could easily control the proceedings through alliances with the smaller states. This began what historians refer to as "The Misery of Austria" in which Austria served as a mere vassal to the superior Germany, a relationship that was to shape history until the end of the First World War. Bismarck had originally managed to convince smaller states like Saxony, Hesse-Kassel, and Hanover to join with Prussia against Austria, after promising them protection from foreign invasion and fair commercial laws.

Bismarck, who by now held the rank of major in the Landwehr, wore this uniform during the campaign and was at last promoted to the rank of major-general in the Landwehr cavalry after the war. Although he never personally commanded troops in the field, he usually wore a general's uniform in public for the rest of his life, as seen in numerous paintings and photographs. He was also given a cash grant by the Prussian Landtag, which he used to purchase a country estate in Varzin, now part of Poland.

Military success brought Bismarck tremendous political support in Prussia. In the elections of 1866 the liberals suffered a major defeat, losing their majority in the House of Deputies. The new, largely conservative House was on much better terms with Bismarck than previous bodies; at the Minister President's request, it retroactively approved the budgets of the past four years, which had been implemented without parliamentary consent. Bismarck suspected it would split the liberal opposition. While some liberals argued that constitutional government was a bright line that should not be crossed, most of them believed it would be a waste of time to oppose the bill, and supported it in hopes of winning more freedom in the future.

Jonathan Steinberg says of Bismarck's achievements to this point:

The scale of Bismarck's triumph cannot be exaggerated. He alone had brought about a complete transformation of the European international order. He had told those who would listen what he intended to do, how he intended to do it, and he did it. He achieved this incredible feat without commanding an army, and without the ability to give an order to the humblest common soldier, without control of a large party, without public support, indeed, in the face of almost universal hostility, without a majority in parliament, without control of his cabinet, and without a loyal following in the bureaucracy. He no longer had the support of the powerful conservative interest groups who had helped him achieve power. The most senior diplomats in the foreign service ... were sworn enemies and he knew it. The Queen and the Royal Family hated him and the King, emotional and unreliable, would soon have his 70th birthday. ... With perfect justice, in August 1866, he punched his fist on his desk and cried "I have beaten them all! All!"

Franco-Prussian War 1870–71

Prussia's victory over Austria increased the already existing tensions with France. The Emperor of France, Napoleon III, had tried to gain territory for France (in Belgium and on the left bank of the Rhine) as a compensation for not joining the war against Prussia and was disappointed by the surprisingly quick outcome of the war. Accordingly, opposition politician Adolphe Thiers claimed that it was France, not Austria, who had really been defeated at Königgrätz. Bismarck, at the same time, did not avoid war with France, though he feared the French for a number of reasons. First, he feared that Austria, hungry for revenge, would ally with the French. Similarly, he feared that the Russian army would assist France to maintain a balance of power. Still, however, Bismarck believed that if the German states perceived France as the aggressor, they would then unite behind the King of Prussia. To achieve this he kept Napoleon III involved in various intrigues, whereby France might gain territory from Luxembourg or Belgium. France never achieved any such gain, but it was made to look greedy and untrustworthy.

A suitable pretext for war arose in 1870, when the German Prince Leopold of Hohenzollern-Sigmaringen was offered the Spanish throne, vacant since a revolution in 1868. France pressured Leopold into withdrawing his candidacy. Not content with this, Paris demanded that Wilhelm, as head of the House of Hohenzollern, assure that no Hohenzollern would ever seek the Spanish crown again. To provoke France into declaring war with Prussia, Bismarck published the Ems Dispatch, a carefully edited version of a conversation between King Wilhelm and the French ambassador to Prussia, Count Benedetti. This conversation had been edited so that each nation felt that its ambassador had been slighted and ridiculed, thus inflaming popular sentiment on both sides in favor of war. Langer, however, argues that this episode played a minor role in causing the war.

Bismarck wrote in his Memoirs that he "had no doubt that a Franco-German war must take place before the construction of a united Germany could be realised." Yet he felt confident that the French army was not prepared to give battle to Germany's numerically larger forces: "If the French fight us alone they are lost." He was also convinced that the French would not be able to find allies since " France, the victor, would be a danger to everybody – Prussia to nobody." He added, "That is our strong point."

France mobilized and declared war on 19 July. The German states saw France as the aggressor, and—swept up by nationalism and patriotic zeal—they rallied to Prussia's side and provided troops. Both of Bismarck's sons served as officers in the Prussian cavalry. The war was a great success for Prussia as the German army, controlled by Chief of Staff Moltke, won victory after victory. The major battles were all fought in one month (7 August to 1 September), and both French armies were captured at Sedan and Metz, the latter after a siege of some weeks. Napoleon III was taken prisoner at Sedan and kept in Germany for a time in case Bismarck had need of him to head the French regime; he later died in exile in England in 1873. The remainder of the war featured a siege of Paris, the city was "ineffectually bombarded"; the new French republican regime then tried, without success, to relieve Paris with various hastily assembled armies and increasingly bitter partisan warfare.

Bismarck quoted the first verse lyrics of "La Marseillaise", amongst others, when being recorded on an Edison phonograph in 1889, the only known recording of his voice. A biographer stated that he did so, 19 years after the war, to mock the French.

Unification of Germany

Anton von Werner's patriotic, much-reproduced depiction of the proclamation of Wilhelm I as German emperor in the Hall of Mirrors at Versailles. Bismarck is in the center, wearing a white uniform. (1885)

Bismarck acted immediately to secure the unification of Germany. He negotiated with representatives of the southern German states, offering special concessions if they agreed to unification. The negotiations succeeded; patriotic sentiment overwhelmed what opposition remained. While the war was in its final phase, Wilhelm I of Prussia was proclaimed German Emperor on 18 January 1871 in the Hall of Mirrors in the Château de Versailles. The new German Empire was a federation: each of its 25 constituent states (kingdoms, grand duchies, duchies, principalities, and free cities) retained some autonomy. The King of Prussia, as German Emperor, was not sovereign over the entirety of Germany; he was only primus inter pares, or first among equals. However, he held the presidency of the Bundesrat, which met to discuss policy presented by the Chancellor, whom the emperor appointed.

In the end, France had to cede Alsace and part of Lorraine, as Moltke and his generals wanted it as a buffer. Historians debate whether Bismarck wanted this annexation or was forced into it by a wave of German public and elite opinion. France was also required to pay an indemnity; the indemnity figure was calculated, on the basis of population, as the precise equivalent of the indemnity that Napoleon I had imposed on Prussia in 1807.

Historians debate whether Bismarck had a master plan to expand the North German Confederation of 1866 to include the remaining independent German states into a single entity or simply to expand the power of the Kingdom of Prussia. They conclude that factors in addition to the strength of Bismarck's Realpolitik led a collection of early modern polities to reorganize political, economic, military, and diplomatic relationships in the 19th century. Reaction to Danish and French nationalism provided foci for expressions of German unity. Military successes—especially those of Prussia—in three regional wars generated enthusiasm and pride that politicians could harness to promote unification. This experience echoed the memory of mutual accomplishment in the Napoleonic Wars, particularly in the War of Liberation of 1813–14. By establishing a Germany without Austria, the political and administrative unification in 1871 at least temporarily solved the problem of dualism.

Jonathan Steinberg said of Bismarck's creation of the German Empire that:

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