Germany is admitted to the League of Nations.

The Weimar Republic, officially known as the German Reich, was the German state from 1919 to 1933, during which it was a constitutional republic for the first time in history; hence it is also referred to, and unofficially proclaimed itself, as the German Republic. The period's informal name is derived from the city of Weimar, which hosted the constituent assembly that established its government. In English, the republic was usually simply called "Germany", with "Weimar Republic" not commonly used until the 1930s. The Weimar Republic had a semi-presidential system.

The League of Nations was the first worldwide intergovernmental organisation whose principal mission was to maintain world peace. It was founded on 10 January 1920 by the Paris Peace Conference that ended the First World War. The main organisation ceased operations on 18 April 1946 when many of its components were relocated into the new United Nations (UN) which was created in the aftermath of the Second World War. As the template for modern global governance, the League profoundly shaped the modern world.