What countries were allies with Britain in the First World War?

During the First World War, Britain was allied with several countries, primarily forming the Triple Entente with France and Russia. Other key allies included Italy, which joined the Allies in 1915, and the United States, which entered the war in 1917. Additionally, countries such as Belgium, Serbia, Japan, and Greece also supported the Allied Powers. Together, these nations worked against the Central Powers, primarily Germany, Austria-Hungary, and the Ottoman Empire.