The document provides a detailed timeline of key events leading up to World War 2 in Europe, beginning with Hitler becoming Chancellor of Germany in January 1933 and continuing until Germany's invasion of the Soviet Union in June 1941. It describes how Hitler rapidly expanded German territory through rearmament, remilitarization of the Rhineland, and annexation of Austria and Czechoslovakia in violation of the Treaty of Versailles. In August 1939, Germany and the Soviet Union surprisingly signed a non-aggression pact to allow Germany to invade Poland unopposed. Germany then swiftly defeated Western European nations through the tactic of blitzkrieg to occupy France, Netherlands, and much of Western Europe by June 1940.