who was all involved in world war 2
World War II by country Nearly every country in the world participated in World War II, with the exception of a few countries that remained neutral. The Second World War pitted two alliances against each other, the Axis powers and the Allied powers. The leading Axis powers were Nazi Germany, the Kingdom of Italy and the Empire of Japan; while the United Kingdom, the United States, the Soviet Union and China were the "Big Four" Allied powers.[1]