<P> The Allies of World War I, or Entente Powers, were the countries that opposed the Central Powers in the First World War . </P> <P> The members of the original Triple Entente of 1907 were the French Republic, the British Empire and the Russian Empire . Italy ended its alliance with the Central Powers, arguing that Germany and Austria - Hungary started the war without prior consultation with all allies and that the alliance was only defensive in nature; it entered the war on the side of the Entente in 1915 . Japan was another important member . Belgium, Serbia, Greece, Montenegro and Romania were affiliated members of the Entente . </P> <P> The 1920 Treaty of Sèvres defines the Principal Allied Powers as the British Empire, French Republic, Italy and Japan . The Allied Powers comprised, together with the Principal Allied Powers, Armenia, Belgium, Greece, Hejaz, Poland, Portugal, Romania, the Serb - Croat - Slovene state and Czechoslovakia . </P> <P> The U.S. declaration of war on Germany, on 6 April 1917 was on the grounds that Germany had violated its neutrality by attacking international shipping, sabotaging munitions on American soil and the Zimmermann Telegram sent to Mexico . It declared war on Austria - Hungary in December 1917 . The U.S. entered the war as an "associated power", rather than as a formal ally of France and the United Kingdom, in order to avoid "foreign entanglements". Although the Ottoman Empire and Bulgaria severed relations with the United States, neither declared war . </P>

Who are the allies of world war 1
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