When did america enter world war 2?

Prior to America's entry into World War II in December 1941, individual Americans volunteered to fight against the Axis powers in other nations' armed forces. read more

Military history of the United States during World War II. The military history of the United States in World War II covers the war against Germany, Italy, Japan and starting with the 7 December 1941 attack on Pearl Harbor. read more

Although the war began with Nazi Germany's attack on Poland in September 1939, the United States did not enter the war until after the Japanese bombed the American fleet in Pearl Harbor, Hawaii, on December 7, 1941. read more

The attack on Pearl Harbor on December 8, 1941, was initially a striking blow to the United States’ ability to wage war in the Pacific. The morning after the attack, the United States declared war on Japan. read more

World War II cost the United States an estimated $341 billion in 1945 dollars – equivalent to 74% of America's GDP and expenditures during the war. In 2015 dollars, the war cost over $4.5 trillion. read more