What soldiers fought in and during world war 1?

World War I saw a diverse array of soldiers fighting on both the Allied and Central Powers sides. The Allies primarily included soldiers from countries such as the United Kingdom, France, Russia, Italy, and later the United States. The Central Powers consisted mainly of Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria. Soldiers came from various backgrounds, including conscripted troops, volunteers, and colonial forces from different parts of the world.