Bundespräsidium in the context of Proclamation of the German Empire

The Constitution of the German Empire (German: Verfassung des Deutschen Reiches) was the basic law of the German Empire. It came into effect on 4 May 1871 and lasted formally until 14 August 1919. Some German historians refer to it as Bismarck's imperial constitution (German: Bismarcksche Reichsverfassung, BRV).

The Constitution created a federation (federally organised national state) of 25 German states under the permanent presidency of Prussia, the largest and most powerful of the states. The presidency (Bundespräsidium) was a hereditary office of the King of Prussia, who had the title of German Emperor. The emperor appointed the chancellor, who was the head of government and chairman of the Bundesrat, the council of representatives of the German states. Laws were enacted by the Bundesrat and the Reichstag, the parliament elected by male Germans above the age of 25 years.

The North German Confederation (German: Norddeutscher Bund) was initially a German military alliance established in August 1866 under the leadership of the Kingdom of Prussia, which was transformed in the subsequent year into a confederated state (a de facto federal state) that existed from July 1867 to December 1870. A milestone of the German Unification, it was the earliest continual legal predecessor of the modern German nation-state known today as the Federal Republic of Germany.

The Confederation came into existence following the Prussian victory in the Austro-Prussian War of 1866 over the lordship of two duchies (Schleswig-Holstein) resulting in the Peace of Prague, where Prussia pressured Austria and its allies into accepting the dissolution of the existing German Confederation (an association of German states under the leadership of the Austrian Empire), thus paving the way for the Lesser German version of German unification in the form of a federal state in Northern Germany. The construction of such a state became a reality in August 1866, following the North German Confederation Treaty, initially as a military alliance only, while its first federal constitution establishing a constitutional monarchy with the Prussian king holding as the head of state the Bundespräsidium was adopted on 1 July 1867. Laws could only be enabled with the consent of the Reichstag (a parliament based on universal male suffrage) and the Federal Council (Bundesrat, a representation of the states). During the initial three and a half years of the Confederation, a conservative-liberal cooperation undertook important steps to unify (Northern) Germany with regard to law and infrastructure. The designed political system and the political parties remained essentially the same also after 1870.