there is not just a country that won the war but a total of 5 counties which were Britain,France,Russia,Italy, and United states which for the Allied powers while the Axis lost Germany Austria-Hungary, Ottoman Empire and Bulgaria.
It grew into a war involving 32 countries. The Allies included Britain,France, Russia, Italy and the United States. These countries fought against the Central Powers which included Germany, Austria-Hungary, Ottoman Empire and Bulgaria.
