On this date King Wilhelm I appointed Otto von Bismarck minister-president and foreign minister of Prussia. The appointment came during a constitutional dispute over military reforms and budgeting, setting up a clash between royal authority and parliament. Bismarck’s strategy was to strengthen Prussia’s army and use diplomacy and limited wars to reshape German politics.
Bismarck spoke to the Prussian House of Representatives’ budget committee about the need for military strength to settle major national questions. The speech is remembered for the phrase often summarized as “blood and iron,” reflecting his belief that power politics, not speeches alone, would decide Germany’s future. It helped define his public image and signaled a harder line in domestic conflict.
Prussian and Austrian forces crossed into Schleswig, starting a war with Denmark over control of Schleswig and Holstein. Bismarck used the conflict to increase Prussia’s influence in German affairs while working with Austria as a temporary partner. The war also created a new dispute about how the conquered duchies would be governed—one of the main triggers of the next war.
The Treaty of Vienna ended the Second Schleswig War. Denmark ceded Schleswig, Holstein, and Lauenburg to Prussia and Austria, which agreed to hold them jointly. This arrangement gave Bismarck both new territory and a built-in political conflict with Austria over administration.
Prussia and Austria signed the Gastein Convention to manage rising tension over Schleswig and Holstein. Prussia took administrative control of Schleswig, while Austria administered Holstein; Lauenburg moved under Prussian control for a payment. The deal reduced immediate friction but did not solve the underlying rivalry—making a future breakdown more likely.
Fighting began in mid-June after disputes over Schleswig-Holstein escalated into a broader struggle for leadership in Germany. Bismarck had prepared the diplomatic ground to isolate Austria and limit outside intervention. The war was short but decisive, reshaping the German political map in Prussia’s favor.
Prussia’s victory at Königgrätz was the decisive turning point of the Austro-Prussian War. It demonstrated the effectiveness of Prussia’s modernized army and helped force Austria to accept a peace settlement. The result opened the way for a Prussian-led federation in northern Germany and pushed Austria out of German political leadership.
Prussia and Austria agreed to a preliminary peace at Nikolsburg soon after Austria’s military defeat. Bismarck argued for relatively moderate terms to avoid turning Austria into a permanent enemy and to keep European powers from intervening. This approach helped make a later political settlement in Germany easier to consolidate.
Prussia and many northern and central German states agreed to form a closer alliance that became the basis for the North German Confederation. This step turned Prussia’s wartime leadership into a new political structure. It was a major transition from loose cooperation to a more unified federal state under Prussian influence.
The Treaty of Prague formally ended the war between Prussia and Austria. Austria accepted exclusion from German federal politics, clearing the path for a new Prussian-led structure in northern Germany. Prussia’s gains and annexations also strengthened its position inside and beyond the German states.
After victory in 1866, Bismarck asked parliament to legalize his earlier collection of taxes during the constitutional conflict. The Bill of Indemnity passed, easing the immediate crisis between the government and liberal legislators. Politically, it also split opposition forces and helped Bismarck govern with more stable parliamentary support.
Voters elected a constituent Reichstag to debate and shape the constitution of the new North German Confederation. Elections used broad male suffrage (for adult men), which gave the new federal system a stronger claim to represent the population than many contemporary monarchies. Bismarck still designed the constitution to keep major power with the monarch and the executive, not parliament.
The constitution established the North German Confederation as a federal state with a Reichstag (elected parliament) and a Bundesrat (council of states). It created the office of chancellor, which Bismarck held, and anchored Prussian leadership inside the federation. This framework later became the main model for the German Empire’s constitution.
A telegram describing a diplomatic encounter at Bad Ems was edited and released to the press in a way that inflamed public opinion in both France and Germany. The episode helped push France toward a declaration of war on Prussia. Bismarck used the crisis to encourage German unity by framing the conflict as a defensive national cause.
France declared war on Prussia, starting a conflict that quickly became a wider German war effort. The war created strong pressure for the southern German states to cooperate with Prussia and the North German Confederation. It also provided the final setting in which Bismarck could turn northern federation into broader national unification.
Bavaria agreed by treaty to join the new German federal arrangement led by the North German Confederation, negotiated during the war. The agreement included special “reserve rights” that allowed Bavaria to keep control over some internal matters (for example, parts of military and administrative authority) within the new empire. This was a key political breakthrough because Bavaria had been one of the strongest defenders of southern independence.
The federal council and Reichstag of the North German Confederation approved changes that adopted the name “German Empire” and recognized the Prussian king as “German Emperor.” These votes linked wartime cooperation to a new constitutional identity, even before the formal proclamation ceremony. The step helped standardize institutions across the expanding federation.
In the Hall of Mirrors at Versailles, Wilhelm I was proclaimed German Emperor, marking the symbolic completion of unification under Prussian leadership. The proclamation followed the wartime agreements that brought the southern states into the federal structure. This closing moment capped Bismarck’s minister-presidency era (1862–1871) by turning his mix of constitutional maneuvering, diplomacy, and war into a new German nation-state.
Otto von Bismarck's minister-presidency and policies (1862–1871)