协约国在第一次世界大战期间与欧洲同盟国对抗的结盟国家，有俄国、法国、英国，后来又有包括美国的其它很多国家， The nations allied against the Central Powers of Europe during World War I. They were Russia, France, Great Britain, and later many others, including the United States.
英国在第一次世界大战中是美国的同盟国。 Britain was an ally of America in the World War I.
