Khan Academy
Khan Academy: Fdr and World War Ii
Discusses how Franklin D. Roosevelt guided the United States through World War II and laid the groundwork for Harry Truman to assume the role after his death.
History of American Wars
History of American Wars: Causes of World War 2: (1939 1945)
A timeline showing the events between 1914 and 1939 that led to the outbreak of World War II, one from March to December of 1941 listing the events leading to America's involvement.