During World War I, what name was given to the countries of Great Britain, France, and the United States?

Prior to the start of World War I, there were two alliances. The Triple Alliance included Germany, Austria-Hungary, and Italy. The Triple Entente included France, Great Britain, and Russia.

When World War I began, the alliances were known as the Central Powers and the Allied Powers. The Central Powers consisted of Germany, Austria-Hungary, Turkey, and Bulgaria. They were fighting against the Allies, which included France, Great Britain, Italy, Russia, and the United States. The United States didn’t enter the war until April 1917. Italy, which had been part of the Triple Alliance with Germany and Austria-Hungary, remained neutral when World War I began. Italy then joined the Allies in 1915. Russia withdrew from World War I as a result of the Russian Revolution. The Treaty of Brest-Litovsk was signed in 1918, formally ending Russian involvement in the war.

Thus, Great Britain, France, Italy, and the United States were the main countries that made up the Allied Powers, or the Allies, in World War I.