Who were the people that fought in world war 2?

World War II involved two major alliances: the Allies and the Axis. The Allies primarily included countries such as the United States, the Soviet Union, the United Kingdom, China, and France, while the Axis powers consisted of Germany, Italy, and Japan. Various other nations participated on both sides, and millions of soldiers and civilians from diverse backgrounds and nationalities were involved in the conflict. The war was marked by significant battles and atrocities, shaping the course of history in the 20th century.