The Allied Forces were a coalition of nations that fought against the Axis powers during World War II. This alliance primarily included major powers such as the United States, United Kingdom, and Soviet Union, who collaborated to defeat the threats posed by Germany, Italy, and Japan. The cooperation among the Allied Forces was crucial for the success of military operations across various theaters of war. Their combined efforts led to significant victories, including the D-Day invasion and the liberation of occupied territories, ultimately contributing to the end of the war in 1945.