Prussia and other northern German states signed the North German Confederation Treaty to create a closer political and military alliance after the Austro-Prussian War. The treaty set a path toward a new federal structure under Prussian leadership. This provided the institutional setting in which pro-unification liberals could organize more effectively.
After Prussia’s 1866 victory over Austria, Otto von Bismarck sought to settle the constitutional conflict over his earlier collection of taxes without parliamentary approval. The Prussian legislature passed the Bill of Indemnity, which effectively accepted the government’s past actions. The vote split liberals between those willing to cooperate with Bismarck for national unity and those who resisted on constitutional grounds.
Elections were held for a constituent Reichstag to draft and approve a constitution for the North German Confederation. The National Liberal Party emerged as the largest bloc, showing that a pro-unification, pro-constitutional liberal force could win mass electoral support. This election marked the party’s practical arrival as a major national political actor.
In 1867, a moderate wing of Prussian liberalism broke away and organized itself into the National Liberal Party, backing Bismarck’s approach to unification under Prussian leadership. The party combined support for national unity with a goal of strengthening law-based constitutional government (even if it accepted a strong monarchy). Its formation created a reliable parliamentary partner for Bismarck inside the new confederation’s political system.
The constitution of the North German Confederation was ratified, establishing a federal system with a Reichstag and a Bundesrat (council of state governments). The Reichstag was elected by broad male suffrage, giving parties like the National Liberals a direct national arena. This constitutional framework shaped how liberal support for unification could translate into legislation.
The North German Confederation began operating as a federal state, moving from treaty plans into day-to-day governance. With the new institutions in place, the National Liberals could pursue their strategy of working inside parliament to influence Bismarck’s nation-building. This shift mattered because it turned political ideas about unity into regular legislative practice.
A new election was held after the constitution was agreed, replacing the constituent Reichstag with a regular one. The National Liberals again won the largest share of seats, showing durable support rather than a one-time protest vote. Their parliamentary weight helped them become key supporters of unification policies during the confederation period.
Elections for the Zollparlament (customs union parliament) brought representatives from southern German states into a shared economic-political forum with North German Confederation deputies. The results showed that many southern delegates were skeptical of political unification under Prussia, limiting the body’s usefulness as a direct unification tool. Still, it kept cross-German issues visible and gave National Liberals another stage to argue for a unified national economy and state.
Bismarck released the Ems Dispatch to the press, a shortened account of a diplomatic exchange that inflamed opinion in both France and Germany. The publication helped push the crisis toward open conflict. For the National Liberals, the mounting confrontation increased the political appeal of unity and strong national institutions.
France declared war on Prussia, beginning the Franco-Prussian War. The conflict became a unifying moment: German states rallied against a common enemy, and Bismarck used the war to draw the southern states closer to the North German Confederation. National Liberals generally backed the war effort as part of completing unification.
During the war, the North German Confederation negotiated the November Treaties with Baden, Hesse, Bavaria, and Württemberg. These agreements created the constitutional basis for expanding the Prussian-led federation to include the south, with certain special rights ("reserve rights") for some states. The treaties moved unification from wartime sentiment into formal legal steps.
The German Empire was proclaimed at Versailles, symbolizing the completion of unification under Prussian leadership during wartime. This event marked the transition from the North German Confederation to a broader German nation-state. The National Liberals’ earlier cooperation with Bismarck now had a clear outcome: a unified empire with a national parliament where they expected to shape law and policy.
Voters elected the first Reichstag of the new German Empire under the interim constitutional arrangements. The National Liberal Party emerged as the largest party, confirming that its pro-unification, pro-constitutional platform had broad support in the new state. This result positioned the party to influence the early imperial government and legislation.
The Constitution of the German Empire took effect, largely building on the earlier North German constitutional model. It confirmed a federal empire under the Prussian king as German emperor, with a chancellor and a Reichstag elected by broad male suffrage. This created the long-term political arena in which the National Liberal Party would become a leading parliamentary force—closing the unification-era rise (1867–1871) with an institutional framework that matched its strategy of influencing nation-building through legislation.
Formation and rise of the National Liberal Party during unification (1867–1871)