Allied Powers: The Allied Powers refer to the countries that fought against the Axis Powers during World War II. They included nations such as the United States, Great Britain, and Soviet Union.
Axis Powers: The Axis Powers were the nations that formed an alliance during World War II. Led by Germany, Italy, and Japan, they opposed the Allied Powers.
Pearl Harbor: Pearl Harbor was a surprise military attack on December 7, 1941, by Japanese forces on the U.S. naval base at Pearl Harbor, Hawaii. This attack prompted direct US involvement in World War II.