ww2 By abbey.hanson Sep 1, 1939 Germany invades Poland, starting World War 2 Sep 19, 1939 Battle of the Atlantic begins day of the month unknown May 12, 1940 Auschwitz established offical date unknown Jul 10, 1940 Battle of Britain begins Dec 11, 1941 Germany and Italy declare war on the United States; then the United States declares war on Germany and Italy Feb 19, 1942 Roosevelt issues Executive Order 9066, which allows the internment of Japanese Americans Sep 3, 1943 Italy surrenders Jul 20, 1944 Assassination attempt against Hitler fails Aug 6, 1945 the united states drops the first atomic bomb on japan Aug 9, 1945 the united states drops the second atomic bomb on japan