World War I was a global conflict from 1914-1918 between the Allied powers of France, Russia, Great Britain, Japan, Italy, Belgium and later the U.S. against the Central Powers of Germany, Austria-Hungary and the Ottoman Empire. World War II was an even more extensive global conflict from 1937-1945 in Asia and 1939-1945 in Europe and Africa between the Allied powers including France, Great Britain, the Soviet Union and the U.S. against the Axis powers of Germany, Japan and Italy. Both wars resulted in major economic, social and political changes across the world as new governments gained power while others fell at the end of each war.