UNITED STATES
The US role in WWII began after japans attack on Pearl Harbour on December 7, 1941 which led to a declaration of war the next day and an alliance with Great Britain and the Soviet Union. America's involvement was decisive, fighting on two major fronts: Europe against Germany and Italy, and the Pacific against Japan. The nation quickly mobilized its military, supplied allies through Lend Lease , and ultimately contributed to the Allied victory, which concluded with Japan's surrender on September 2, 1945.
