The document summarizes key events in Europe from 1919 to 1939 leading up to World War 2. It discusses the establishment of the Weimar Republic after WWI and Hitler's rise to power in Germany in 1933. It then outlines Germany's violations of the Treaty of Versailles through remilitarization of the Rhineland in 1936, annexation of Austria and Czechoslovakia's Sudetenland in 1938, and the non-aggression pact with the Soviet Union in 1939. Throughout this period, the League of Nations failed to stop German aggression.