Which countries were part of the Allied Powers during World War I?

The Allied Powers during World War I included Britain, France, Russia, Italy, and the United States, which is represented by the chosen answer. These nations formed a coalition primarily to oppose the Central Powers, which included Germany, Austria-Hungary, and the Ottoman Empire.

The alliances during World War I were complex, but the major Allies worked together to coordinate military strategies and resources. Britain and France were key players from the war's outset, while Russia joined early on but exited the war in 1917 due to internal revolution. Italy, initially part of the Triple Alliance with Germany and Austria-Hungary, switched sides and joined the Allies in 1915, motivated by territorial ambitions. The United States entered the war later, in 1917, which provided a significant boost to the Allied efforts.

Understanding these relationships and the motivations behind the alliances provides context for the dynamics of World War I, illustrating the global scale of the conflict and the shift in power that occurred during this period.