World War II Timeline by Joshua Fabian By Joshfabian6 Sep 1, 1939 Word War II begins Sep 3, 1939 Britain, France, Australia and New Zealand declare war on Germany. Apr 9, 1940 Nazis invade Denmark and Norway. Jul 1, 1940 German U-boats attack merchant ships in the Atlantic. Jul 10, 1940 Battle of Britain begins. Sep 16, 1940 United States military conscription bill passed. Mar 11, 1941 President Roosevelt signs the Lend-Lease Act. Dec 7, 1941 Japanese bomb pearl harbor Dec 8, 1941 Untied States and Britain declare war on Japan. Jan 1, 1942 Declaration of the United Nations signed by 26 Allied nations. Jan 13, 1942 Germans begin a U-boat offensive along east coast of USA.
