What countries played a role or particpated in World War 2?

World War II involved many countries, primarily divided into two opposing military alliances: the Allies and the Axis. Key Allied nations included the United States, the Soviet Union, the United Kingdom, and China, while major Axis powers were Germany, Italy, and Japan. Numerous other countries participated or were affected by the war, either by joining one of the alliances or being occupied by foreign powers. The conflict spanned across Europe, Asia, Africa, and the Pacific, making it a truly global war.