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Participants in World War I

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Image:Europe 1914.jpg

Image:WWI-re.png

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

1 The Entente Forces
2 The Central Powers
3 Neutral states
4 Declarations of War
5 Notes
6 See also

[edit] The Entente Forces

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

[edit] The Central Powers

[edit] Neutral states

Image:Flag of Colombia.svg Colombia
Image:Flag of Denmark.svg Denmark - However, Denmark did financially support Germany.
Image:Flag of El Salvador.svg El Salvador
Image:Flag of Ethiopia (1897).png Ethiopia
Image:Flag of the Netherlands.svg Netherlands - An Ally of the UK by treaty.
Image:Flag of Norway.svg Norway - Gave naval assistance to the UK.
Image:Flag of Paraguay.svg Paraguay
Spain - Also treaty bond ally to the UK.
Image:Flag of Sweden.svg Sweden - Financially supported Germany.
Image:Flag of Switzerland.svg Switzerland - Switzerland did declare a "state of siege".
Image:Flag of Venezuela.svg Venezuela- Supplied the Allies with oil.

[edit] Declarations of War

Image:World War I 1914 08 04.png Image:World War I 1918 05.png The following table shows the timeline of the several declarations of war ^[2] among the belligerent powers.

Date	Declarer	On
1914
July 28	Austria-Hungary	Serbia
August 1	Germany	Russia
August 3	Germany	France
August 4	United Kingdom	Germany
August 4	Germany	Belgium
August 5	Montenegro	Austria-Hungary
August 6	Austria-Hungary	Russia
August 6	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
June 3	San Marino	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
August 27	Italy	Germany
August 28	Germany	Romania
August 30	Ottoman Empire	Romania
November 1	Bulgaria	Romania
1917
April 6	United States	Germany
April 7	Cuba	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	Thailand	Germany Austria-Hungary
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

[edit] Notes

↑ 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.
↑ Entries on a yellowish background refer to severed diplomatic relations only, not to actual declarations of war