List of monarchs of Prussia in the context of "Kingdom of Prussia"

The German Empire (German: Deutsches Reich), also referred to as Imperial Germany, the Second Reich, or simply Germany, was the period of the German Reich from the unification of Germany in 1871 until the November Revolution in 1918, when Germany changed its form of government to a republic. The German Empire consisted of 25 states, each with its own nobility: four constituent kingdoms, six grand duchies, five duchies (six before 1876), seven principalities, three free Hanseatic cities, and one imperial territory. While Prussia was only one of the four kingdoms in the realm, it contained about two-thirds of the Empire's population and territory, and Prussian dominance was also constitutionally established, since the King of Prussia was also the German Emperor (Deutscher Kaiser).

The empire was founded on 18 January 1871, when the south German states, except for Austria, Switzerland and Liechtenstein, joined the North German Confederation. The new constitution came into force on 16 April, changing the name of the federal state to the German Empire and introducing the title of German Emperor for Wilhelm I, King of Prussia from the House of Hohenzollern. Berlin remained its capital, and Otto von Bismarck, Minister President of Prussia, became chancellor, the head of government. After 1850, the states of Germany had rapidly become industrialized. In 1871, Germany had a population of 41 million people; by 1913, this had increased to 68 million. A heavily rural collection of states in 1815, the now united Germany became predominantly urban. German factories were often larger and more modern than many of their British and French counterparts, but the preindustrial sector was more backward. The success of the German Empire in the natural sciences was such that one-third of all Nobel Prizes went to German inventors and researchers. During its 47 years of existence, the German Empire became an industrial, technological, and scientific power in Europe, and by 1913, Germany was the largest economy in continental Europe and the third largest in the world. Germany also became a great power, building the longest railway network of Europe, the world's strongest army, and a fast-growing industrial base. Starting very small in 1871, in a decade, the navy became second only to Britain's Royal Navy.

The abdication of Wilhelm II as German Emperor and King of Prussia was declared unilaterally by Chancellor Max von Baden at the height of the German revolution on 9 November 1918, two days before the end of World War I. It was formally affirmed by a written statement from Wilhelm on 28 November while he was in exile in Amerongen, the Netherlands. The abdication ended the House of Hohenzollern's 300-year rule over Prussia and 500-year rule over its predecessor state, Brandenburg. With the loss of the monarchical legitimacy that was embodied by the emperor, the rulers of the Empire's 22 monarchical states also relinquished their royal titles and domains.

Wilhelm's abdication was triggered by Germany's impending defeat in World War I. In an attempt to obtain better terms from the Allies, a number of changes were made in the government and the constitution to partially democratise the Empire. The political changes were not enough to satisfy US President Woodrow Wilson, who was leading the attempt to broker an armistice. When it became clear that he wanted Wilhelm to abdicate, both the military and the government began to make various plans to save the monarchy through a regency or some other means after Wilhelm stepped down. The outbreak of the German revolution in the first days of November 1918 increased the pressure on Wilhelm to abdicate, but he continued to refuse. In order to calm the volatile situation in Berlin, Chancellor Baden, without Wilhelm's knowledge or approval, announced on 9 November that the Emperor had abdicated. Later that afternoon, Germany was proclaimed a republic, and Wilhelm went into exile in the Netherlands the next day. His official abdication came on 28 November. The 500-year-old Hohenzollern dynasty ended quietly, with almost no violence or fanfare.

The Brandenburg Gate (German: Brandenburger Tor [ˈbʁandn̩ˌbʊʁɡɐ ˈtoːɐ̯] ) is an 18th-century neoclassical monument in Berlin. One of the best-known landmarks of Germany, it was erected on the site of a former city gate that marked the start of the road from Berlin to Brandenburg an der Havel, the former capital of the Margraviate of Brandenburg. The current structure was built from 1788 to 1791 by orders of King Frederick William II of Prussia, based on designs by the royal architect Carl Gotthard Langhans. The bronze sculpture of the quadriga crowning the gate is a work by the sculptor Johann Gottfried Schadow.

The Brandenburg Gate is located in the western part of the city centre within Mitte, at the junction of Unter den Linden and Ebertstraße. The gate dominates the Pariser Platz to the east, while to the immediate west it opens onto the Platz des 18. März beyond which the Straße des 17. Juni begins. One block to the north stands the Reichstag building, home to the German parliament (Bundestag), and further to the west is the Tiergarten inner-city park. The gate also forms the monumental entry to Unter den Linden, which leads directly to the former City Palace of the Prussian monarchs (now housing the Humboldt Forum museum), and Berlin Cathedral.

Präsidium des Bundes or Bundespräsidium (German: [ˈbʊndəs.pʁɛˌziːdi̯ʊm], roughly chairmanship of the federation) was a title under the German Confederation (1815–1848, 1851–1866) whereby the Austrian delegate held the chair of the Federal Assembly. Austria was thus called the presiding power (German: Präsidialmacht). This did not give Austria extra competencies: its delegate simply led the proceedings of the Federal Assembly.

Later, during the North German Confederation (1867–1871), the same title was used for an office functioning as head of state. According to the constitution, the holder of this office was always the king of Prussia. The king was also Bundesfeldherr, federal commander-in-chief. The constitutional changes of 1870–1871 renamed the North German Confederation to the German Empire; the title and function of Bundespräsidium remained, but was combined with the additional title Deutscher Kaiser (German Emperor).