The Axis powers-Germany, Italy, and Japan-attempted to dominate the world. The Allies (U.S., Britain, France, USSR, and others) fought to stop them. The United States entered the war in 1941, after Japan's attack on Pearl Harbor. Germany surrendered in 1945, and Japan surrendered later that same year, after the U.S. dropped the atomic bomb on the cities of Hiroshima and Nagasaki.
