What year did america enter ww2?

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

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

World War II (1939-1945) was the largest armed conflict in human history. Ranging over six continents and all the world's oceans, the war caused an estimated 50 million military and civilian deaths, including those of 6 million Jews. read more

In March, 1941, a few months after the German campaign against France had ended, in June, 1940, and after the inspiring (to Americans) Battle of Britain, the first major conflict of World War II won by the Allies, thus giving hope that Britain could in fact stand up to Germany, Congress passed the Lend-Lease Act, authorizing President Franklin D. Roosevelt to loan and sell and then ship to Britain and her allies material support which could thwart further Nazi German aggression. read more