Who were the main country's in WW2?

The main countries involved in World War II were divided into two primary alliances: the Allies and the Axis. The Allies primarily included the United States, the Soviet Union, the United Kingdom, and China, while the Axis powers were led by Germany, Italy, and Japan. These nations played pivotal roles in the conflict, which lasted from 1939 to 1945 and resulted in significant global changes. The war concluded with the defeat of the Axis powers, leading to the establishment of the United Nations and the beginning of the Cold War.