World War II By Timkraft Period: Mar 15, 1939 to Nov 1, 1945 World War II Sep 1, 1939 The first clash Hitler invades Poland. Jun 10, 1940 Axis powers Italy joins the war as an ally of Germany. Dec 7, 1941 Pearl Harbor Japan bombed Pearl Harbor. The next day, U.S. declares war on Japan. Oct 6, 1943 Italy backstabs Italy declares war on Germany Nov 1, 1945 Done World War II is done.
