Question: Otto Eduard Leopold, Prince of Bismarck's titled name, Otto von Bismarck, comes from Bismarck, in what district of Germany?

Context paragraphs:
Otto von Bismarck: Otto Eduard Leopold, Prince of Bismarck, Duke of Lauenburg (1 April 1815 – 30 July 1898), known as Otto von Bismarck (] ), was a conservative Prussian statesman who dominated German and European affairs from the 1860s until 1890.  In the 1860s, he engineered a series of wars that unified the German states, deliberately excluding Austria, into a powerful German Empire under Prussian leadership.  With that accomplished by 1871, he skillfully used balance of power diplomacy to maintain Germany's position in a Europe which, despite many disputes and war scares, remained at peace.  For historian Eric Hobsbawm, it was Bismarck who "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 nationalism and promoted Germanophobia in France.  This helped set the stage for the First World War.

SMS Fürst Bismarck: SMS "Fürst Bismarck" ("Prince Bismarck") was Germany's first armored cruiser, built for the Kaiserliche Marine before the turn of the 20th century.  The ship was named for the German statesman Otto von Bismarck.  The design for "Fürst Bismarck" was an improvement over the previous "Victoria Louise"-class protected cruiser—"Fürst Bismarck" was significantly larger and better armed than her predecessors.

Fürst von Bismarck: The great German statesman and diplomat Otto von Bismarck (1815–1898) received several noble titles during the course of his career.  Already born into a noble Junker family, the House of Bismarck, he began life as simply "Mr (German:"Herr") Otto Eduard Leopold von Bismarck".

House of Bismarck: The House of Bismarck is a German noble family that rose to prominence in the 19th-century, largely through the achievements of the statesman Otto von Bismarck.  He was granted the hereditary title of Prince of Bismarck in 1871, a hereditary comital title in 1865 and a ducal title, Duke of Lauenburg, held only for his own lifetime.  Several of Otto's descendants, notably his son Herbert, Prince of Bismarck, were also politicians.

Herbert von Bismarck: Nicolaus Heinrich Ferdinand Herbert, Prince von Bismarck (28 December 1849 – 18 September 1904) was a German politician, who served as Foreign Secretary from 1886 to 1890.  His political career was closely tied to that of his father, Otto von Bismarck, and he left office a few days after his father's dismissal.  He succeeded his father as the 2nd Prince of Bismarck in 1898.  He was born in Berlin and died in Friedrichsruh.

Wettin, Saxony-Anhalt: Wettin is a small town and a former municipality in the Saalekreis district of Saxony-Anhalt, Germany, situated on the River Saale north of Halle.  Since 1 January 2011, it is part of the town Löbejün-Wettin.  It is known for Wettin Castle, the ancestral seat of the House of Wettin, ruling dynasty of Saxony and Poland.  Wettin sights include the Tower of Bismarck, the town hall, and the castle (used as the Burggymnasium).

William I, German Emperor: William I, or in German Wilhelm I (full name: "William Frederick Louis of Hohenzollern", German: "Wilhelm Friedrich Ludwig von Hohenzollern" , 22 March 1797 – 9 March 1888), of the House of Hohenzollern was King of Prussia from 2 January 1861 and the first German Emperor from 1 January 1871 to his death, the first Head of State of a united Germany.  Under the leadership of William and his Minister President Otto von Bismarck, Prussia achieved the unification of Germany and the establishment of the German Empire.  Despite his long support of Otto von Bismarck as Minister President, William held strong reservations about some of Bismarck's more reactionary policies, including his anti-Catholicism and tough handling of subordinates.  Contrary to the domineering Bismarck, William was described as polite, gentlemanly and, while a staunch conservative, more open to certain classical liberal ideas than his grandson Wilhelm II.

State Socialism (Germany): State Socialism (German: "Staatssozialismus" ) was a term introduced to describe Otto von Bismarck's social welfare policies.  The term was actually coined by Bismarck's liberal opposition but later accepted by Bismarck.  They refer to a set of social programs implemented in Germany that were initiated by Bismarck in 1883 as remedial measures to appease the working class and detract support for socialism and the Social Democratic Party of Germany following earlier attempts to achieve the same objective through Bismarck's anti-socialist laws.

Treaty of Berlin (1889): The Treaty of Berlin (1889) was the concluding document of the conference at Berlin in 1889 on Samoa.  The conference was proposed by German foreign minister Count Herbert von Bismarck (son of chancellor Otto von Bismarck) to reconvene the adjourned Washington conference on Samoa of 1887.  Herbert von Bismarck invited delegations from the United States and the British Empire to Berlin in April 1889.

Wilhelm von Bismarck: Count Wilhelm von Bismarck-Schönhausen (né "Wilhelm Otto Albrecht von Bismarck") (1 August 1852 – 30 May 1901) was a German counselor, civil servant and politician, who served as a member of the Reichstag from 1880 to 1881 and president of the Regency of Hanover from 1889 to 1890.  The youngest son of Otto von Bismarck, he and his brother Herbert von Bismarck both resigned their posts after the elder Bismarck was dismissed as Chancellor of Germany in 1890.  Wilhelm subsequently accepted an appointment as Governor of East Prussia in 1894.

Supporting paragraphs: Wettin, Saxony-Anhalt Otto von Bismarck
Answer: Saalekreis