1919    The League of Nations is founded.

1920    The League of Nations holds its first meeting, and ratifies the Treaty of Versailles, therefore ending World War I.

1920    The United States Senate votes against joining the League of Nations.

1920    First assembly of the League of Nations is held in Geneva.

1922    The League of Nations awards mandates of Togoland to France and Tanganyika to the United Kingdom.

1922    Hungary is admitted to League of Nations.

1924    The Geneva Protocol is adopted as a means to strengthen the League of Nations.

1926    Brazil leaves the League of Nations

1926    Germany is admitted to the League of Nations.

1933    Germany withdraws from the League of Nations.

1933    Adolf Hitler withdraws Nazi Germany from the League of Nations

1935    The League of Nations places economic sanctions on fascist Italy for its invasion of Ethiopia.

1936    Emperor Haile Selassie of Abyssinia appeals for aid to the League of Nations against Italy's invasion of his country.

1937    The League of Nations bans foreign national "volunteers" in the Spanish Civil War.

1937    Second Italo-Abyssinian War: Italy leaves the League of Nations.

1938    The League of Nations unanimously outlaws "intentional bombings of civilian populations".

1939    Winter War: The Soviet Union is expelled from the League of Nations for invading Finland.

1940    Denmark leaves the League of Nations.

1946    The last meeting of the League of Nations, the precursor of the United Nations, is held.