<Tr> <Td> Allies of World War II </Td> <Td> </Td> </Tr> <P> The Allies of World War I or Entente Powers is the term commonly used for the coalition that opposed the Central Powers of Germany, Austria - Hungary, the Ottoman Empire and Bulgaria during the 1914 - 1918 First World War . The Allies were further divided into so - called Principal and Associated or Affiliated Powers . </P> <P> In 1907, the French Republic, the British Empire and the Russian Empire formed the Triple Entente; entry into the war in 1914 automatically involved their respective colonies, while Japan was added to the Entente in August 1914 . Italy was originally part of the 1882 Triple Alliance with Germany and Austria - Hungary but remained neutral in 1914 before joining the Entente in 1915 . Affiliated members included Belgium, Serbia, Greece, Montenegro and Romania . </P> <P> In April 1917, the United States declared war on Germany, then Austria in December 1917; although the Ottoman Empire and Bulgaria broke off diplomatic relations with the US, neither declared war . The US did so as a co-belligerent, rather than a formal member of the Entente, due to the long - standing American opposition to "foreign entanglements". </P>

Which side was russia on in the first world war
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