World War 2 By KMartinez123 Sep 1, 1939 Germany invades Poland Sep 5, 1939 Neutrality The United States government declares its neutrality in the European conflict. Nov 5, 1940 Franklin Roosevelt Franklin Roosevelt was reelected for his 3rd as president of the United States Dec 7, 1941 Japan bombs Pearl Harbor Dec 8, 1941 USA and Britain formally declare war on Japan 1943 USSR defeats Germany at the Battle of Stalingrad Jun 6, 1944 D-Day Aug 6, 1945 Hiroshima and Nagasaki USA drops atomic bombs in Hiroshima and Nagasaki Aug 14, 1945 Japan Surrenders