WWII By stevegant15 Sep 14, 1930 Germans elect Nazis making them the 2nd largest political party in Germany. Jan 30, 1933 Adolf Hitler becomes Chancellor of Germany. Mar 12, 1933 First concentration camp opened at Oranienburg outside Berlin. Aug 19, 1934 Adolf Hitler becomes Führer of Germany. Mar 7, 1936 German troops occupy the Rhineland. Nov 5, 1937 Hitler reveals war plans during Hossbach Conference. Aug 12, 1938 German military mobilizes Oct 15, 1938 German troops occupy the Sudetenland; Czech government resigns. Aug 23, 1939 Nazis and Soviets sign Pact. Sep 17, 1939 Soviets invade Poland. May 10, 1940 Nazis invade France, Belgium, Luxembourg and the Netherlands; Winston Churchill becomes British Prime Minister. Sep 15, 1940 Massive German air raids on London, Southampton, Bristol, Cardiff, Liverpool and Manchester. Nov 20, 1940 Hungary/Romania join the Axis Powers. Apr 23, 1941 Yugoslavia/Greece surrender to the Nazis Sep 3, 1941 First experimental use of gas chambers at Auschwitz Dec 7, 1941 Japanese bomb Pearl Harbor.. We declare war Jan 26, 1942 First American forces arrive in Great Britain.