Attitude of the U.S. Before Pearl Harbor. Public opinion in the United States was divided. Although most Americans favored the Allied cause, there was strong opposition to even indirect involvement in the war. The German-American Bund and the America First movement were especially active in opposing aid to the Allies. The American Communists also opposed aid—until Germany attacked the Soviet Union; then they demanded immediate intervention.
World War II was a horrific period in history during which 50 million people perished from death camps, atomic bombs, and years of battle. Often called the Janus event of the 20th century, WWII is truly unforgettable. Learn how the Allies defeated Nazi Germany.
This World War II timeline highlights important dates from September 1939 to April 1940. This time period saw the official start to World War II on September 1, 1939 when Germany invaded Poland. Follow the events of World War II and the German invasion.