Participants in World War I

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  Allies (at one point or another)
  Neutral countries

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

Allies / Entente Powers[edit]

Colonies, condominiums, protectorates, states and territories
Non-state actors

Central Powers[edit]

Colonies, condominiums, protectorates, states and territories
Non-state actors

Russia / Russian Soviet Republic / Russian Socialist Federative Soviet Republic and allies[edit]

Non-state actors

Neutral countries[edit]

Declared neutral colonies, condominiums, protectorates, states and territories
De facto netural colonies, condominiums, protectorates, states and territories
Non-state actors

Notes[edit]

  1. ^ Gave naval assistance to the United Kingdom
  2. ^ Non-belligerent
  3. ^ Traded with both sides
  4. ^ Civil dispute and Allied Campaign against Ottomans
  5. ^ Switzerland did declare a "state of siege"
  6. ^ Received a German diplomatic mission trying to convince it to act against the British in India
  7. ^ Supported Central Powers and was on the verge of entering the war before Iyasu V's dethronement
  8. ^ Never declared war on the Central Powers despite being invaded and occupied by Germany
  9. ^ Had a customs and monetary union with Austria-Hungary
  10. ^ 20 volunteers joined on the Italian (Allied) side. Cut diplomatic ties with Austria–Hungary, but it never entered the war
  11. ^ Declined an alliance with Germany (see Zimmermann Telegram)

Declarations of war[edit]

European military alliances prior to the 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 among the belligerent powers. Entries on a yellow background show severed diplomatic relations only, not actual declarations of war.

Date Declarer On
1914
July 28  Austria-Hungary  Serbia
August 1  Germany  Russia
August 3  Germany  France
August 4  Germany  Belgium
 United Kingdom  Germany
August 5  Montenegro  Austria-Hungary
August 6  Austria-Hungary  Russia
 Serbia  Germany
August 9  Montenegro  Germany
August 11  France  Austria-Hungary
August 12  United Kingdom  Austria-Hungary
August 22  Austria-Hungary  Belgium
August 23  Japan  Germany
August 25  Japan  Austria-Hungary
November 1  Russia  Ottoman Empire
November 2  Serbia  Ottoman Empire
November 3  Montenegro  Ottoman Empire
November 5  United Kingdom
 France
 Ottoman Empire
1915
May 23  Italy  Austria-Hungary
August 21  Italy  Ottoman Empire
October 14  Bulgaria  Serbia
October 15  United Kingdom
 Montenegro
 Bulgaria
October 16  France  Bulgaria
October 19  Italy
 Russia
 Bulgaria
1916
March 9  Germany  Portugal
March 15  Austria-Hungary  Portugal
August 27  Romania  Austria-Hungary
 Italy  Germany
August 28  Germany  Romania
August 30  Ottoman Empire  Romania
November 1  Bulgaria  Romania
1917
April 6  United States  Germany
April 7  Cuba
 Panama
 Germany
April 10  Bulgaria  United States
April 13  Bolivia  Germany
April 20  Ottoman Empire  United States
July 2  Greece  Germany
 Austria-Hungary
 Ottoman Empire
 Bulgaria
July 22  Siam  Germany
 Austria-Hungary
 Ottoman Empire
August 4  Liberia  Germany
August 14  China  Germany
 Austria-Hungary
October 6  Peru  Germany
October 7  Uruguay  Germany
October 26  Brazil  Germany
December 7  United States  Austria-Hungary
December 7  Ecuador  Germany
December 10  Panama  Austria-Hungary
December 16  Cuba  Austria-Hungary
1918
April 23  Guatemala  Germany
May 8  Nicaragua  Germany
 Austria-Hungary
May 23  Costa Rica  Germany
July 12  Haiti  Germany
July 19  Honduras  Germany
November 10  Romania  Germany

See also[edit]

Notes and references[edit]

  1. ^ 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; Australia, Canada, Newfoundland, New Zealand and South Africa. At that time, the United Kingdom of Great Britain and Ireland also included the entire island of Ireland.