jan 1, 1939 - The U.S. shifted from strict isolationism to total war between 1939 and 1941. Driven by the December 1941 Pearl Harbor attack, America officially entered WWII, rapidly mobilized its industrial and military power to defeat the Axis forces in the European and Pacific theaters by 1945
Added to timeline:
Date:
jan 1, 1939
Now
~ 87 years ago