World War II - By Brandon Black. By brandonblack Sep 1, 1939 Germany invades Poland Period: Sep 1, 1939 to Sep 2, 1945 World War II May 10, 1940 Winston Churchill becomes Prime Minister of UK Jun 22, 1941 Hitler begins Operation Barbarossa The invasion of Russia. Dec 7, 1941 Japan attacks Pearl Habour Dec 8, 1941 America Joins the War. Jun 18, 1942 Mass murder at Auschwitz begins. Sep 8, 1943 Italy Surrenders. Apr 30, 1945 Hitler Committs suicide May 8, 1945 Truman becomes Pesident of USA Jun 27, 1945 Auschwitz liberated by Soviet troops Aug 6, 1945 USA Nukes Japan Japan surrenders. Aug 30, 1945 The War is Over.