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The definition of "enemy" depends on which side you were part of. The two opposing sides were known as the Allied ( or Entente) Powers and the Central Powers.

The Central Powers were:

Germany

Austria-Hungary

Ottoman Empire

Bulgaria (1915-18)

The Allied Powers were primarily:

Russia (1914-17)

British Empire

France

Italy (1915-18)

United States (1917-18)

Romania (1916-18)

Japan

Serbia

Belgium

Greece (1917-18)

Portugal (1916-18)

Montenegro (1914-16)

Note that the nations involved changed over the course of the war.

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13y ago

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