There were many. The "Big Three" were the United States, the USSR (Soviet Union), and Britain. Other countries included France, Poland, the UK, China, Australia, Norway, and more.
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we fought japan,germany,and russia we had a cold war.
World War 1 was mainly fought in France and Belgium, north-west of Paris. Europe. Main countries involved were England, Belgium, France, Germany, and America.
Some countries have accurace (or as accurate as possible) records of who fought in their forces in World War I; but some countries for various reasons have little or no records of this information.
Germany
germany, italy, and japan