World War Two World War II World War II entered World War II World War II approximately 16 million World War II World War II - United States American History entered World War II entered World War II entered World War II United States History - World War II Great Depression entered World War II Wars and Battles, 1939-1945 World War II World War II http://www.u-s-history.com/pages/h1661.html United States History - World War II World War Two entered World War II World War II United States History - World War II World War Two World War Two World War II http://www.u-s-history.com/pages/h1661.html World War II approximately 16 million World War II World War II World War II - United States History World War II WWII World War II