Timeline of WWII and Its Impact By kevin.latham Nov 11, 1918 World War 1 ends with German defeat Apr 28, 1919 League of Nations is founded Jul 29, 1921 Adolf Hitler becomes leader of the Nation Socialist (Nazi) Party Sep 8, 1926 Germany is admitted in League of Nations Oct 29, 1929 U.S. Stock Market Crashes Nov 8, 1932 Franklin Roosevelt becomes president of the U.S. Jan 30, 1933 Adolf Hitler is named Chancellor of Germany Oct 13, 1933 Germany leaves League of Nations Aug 23, 1939 Germany and Soviet Russia sign non-agression pact Sep 1, 1939 Germany Invades Poland May 10, 1940 Winston Churchill becomes British Prime Minister