The Weimar Republic
From 1918 to 1933, Germany was governed by the Weimar Republic, also known as the German Reich (Deutsches Reich), the first constitutional federal republic in history. As such, it is also known as the German Republic and unofficially declared itself to be so (Deutsche Republik). The city of Weimar, which conducted the constituent assembly that founded the state's government, is where the state's informal name originates. The state was typically referred to in English as "Germany," with the title "Weimar Republic" (which Adolf Hitler coined in 1929) not becoming widely used until the 1930s.
Germany, which had suffered greatly during the First World War (1914–1918), was worn out and made a desperate request for peace. The Weimar Republic was declared on November 9 after the abdication of Kaiser Wilhelm II, a formal resignation to the Allies, and the realization of impending defeat.