There were a total of 57 countries and commonwealth nations participated in the Second World War.
The countries in the axis side includes: Germany, Japan, Italy, Hungary, Slovakia, Bulgaria, Croatia, Romania, Albania, Finland, USSR(1939-1940) and Thailand.
The Allied countries includes: Poland, Czechoslovakia, France, Brazil, India, Mexico, Ethiopia, Australia, Iraq, New Zealand, Bolivia, Union of South Africa, Iran, Canada, Columbia, Norway, Belgium, Liberia, Luxemburg, Ecuador, Netherlands, Paraguay, Greece, Peru, Yugoslavia, USSR (after 1940), Chile, Venezuela, Uruguay, United States, Turkey, Philippine Commonwealth, Egypt, Panama, Syria, Costa Rica, Lebanon, Dominican Republic, Saudi Arabia, Nicaragua, Argentina, Salvador, Honduras, Mongolian People's Republic, Guatamala and People's Republic of China.
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ten countries
None. World War 2 ended in 1945.
World War 2 involved many important people. By the very nature of this war many countries and their leaders, both of governments and armies, were involved.
Countries selling weapons and supplies to the countries at war
All of them hence the name WORLD WAR