Participants in World War I

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European military alliances in 1915. The Central Powers are depicted in puce, the Allies in grey and neutral countries in yellow.

Map of the World with the Participants in World War I. The Allies are depicted in green, the Central Powers in yellow, and neutral countries in grey.

This is a list of countries that participated in World War I, sorted by alphabetical order.

[edit] The Entente Forces

Note: The Entente Forces are sometimes also referred to as the Entente Powers or Allies of World War I.

• Albania
•  Andorra
• Democratic Republic of Armenia
•  Belgium
•  Bolivia
•  Brazil
• British Empire^[1]
  • Australia
  • Canada
  • Indian Empire (Now Bangladesh, India and Pakistan)
  •  Newfoundland
  • New Zealand
  • Union of South Africa
  • United Kingdom of Great Britain and Ireland
  • British crown colonies
• Republic of China
•  Costa Rica
• Czechoslovak Legions
•  Cuba
•  Ecuador
•  France
• Kingdom of Greece
•  Guatemala
•  Haiti
•  Honduras
• Kingdom of Italy
• Empire of Japan
•  Liberia
• Kingdom of Montenegro
•  Nicaragua
•  Panama
•  Peru
• Portugal
• Kingdom of Romania
•  Russian Empire
•  San Marino
• Kingdom of Serbia
• Siam (now Thailand)
•  Uruguay
•  United States of America

[edit] The Central Powers

•  Austria-Hungary
• Bulgaria
•  German Empire
•  Ottoman Empire

[edit] Neutral states

•  Afghanistan - Did not support or oppose any nation.
•  Argentina
•  Colombia
•  Denmark - Traded with both sides.
•  El Salvador
• Ethiopia
• Luxembourg - Never declared war on the Central Powers despite being invaded and occupied by Germany.
•  Mexico - Declined an alliance with Germany (see Zimmermann Telegram).
• Netherlands - An Ally of the UK by treaty.
•  Norway - Gave naval assistance to the UK.
•  Paraguay
• Persia - Occupied by British and Russian troops.
• Spain - Also treaty bound ally to the UK.
•  Sweden - Financially supported Germany.
•  Switzerland - Switzerland did declare a "state of siege".
•  Tibet
•  Venezuela - Supplied the Allies with oil.

[edit] Declarations of War

Allies and Central Powers, early August 1914.

Allies and Central Powers, mid 1918.

The following table shows the timeline of the several declarations of war ^[2] among the belligerent powers.

[edit] Notes

1. ^  The British Empire was the common term for the United Kingdom and its overseas possessions at this time. The term refers to the colonies it controlled, to the Indian Empire, which, while not officially designated a colony, was functionally indistinguishable from one, and the British Dominions - former colonies which were self-governing in most respects but whose foreign policy was controlled by London; Canada, Australia, Newfoundland, New Zealand and South Africa.
2. ^  Entries on a yellowish background refer to severed diplomatic relations only, not to actual declarations of war

[edit] See also

• Allies of World War I
• Triple Entente
• Triple Alliance
• Central Powers

World War I Portal