There emerged two rival camps in the world, i.e., the Axis nations and the Allies camp. In the beginning of the war, Axis nations got many successes. After getting hold on the eastern part of Asia, they attacked Pearl Harbour in Dec. 1941. It was the Naval Centre of America. Angered by this attack, America too jumped into the war. After this, the Allies started a big fight. Their forces got France freed from Hitler. Italy surrendered itself. In May 1945, Berlin was defeated. In August 1945, Japan too was defeated- when America dropped atom bombs on its Nagasaki and Hiroshima cities.