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Flags of Nations

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Central Powers.
 Central Powers 
Allied Powers.
 Allied Powers 
Neutral Nations.
 Neutral Nations 
All Nations.
 All Nations 

Dates - Declaration of War

 GermanyAustria-HungaryOttoman EmpireBulgaria
BelgiumAugust 4, 1914August 28, 1914  
Bolivia **April 13, 1917 *   
Brazil **October 26, 1917   
British EmpireAugust 4, 1914August 12, 1914November 5, 1914October 15, 1915
China **August 14, 1917August 14, 1917  
Costa Rica **May 23, 1918   
Cuba **April 7, 1917   
Ecuador **December 8, 1917 *   
FranceAugust 3, 1914August 10, 1914November 5, 1914October 16, 1915
GreeceJune 27, 1917June 27, 1917June 27, 1917June 27, 1917
Guatemala **April 22, 1918   
Haiti **July 15, 1918   
Honduras **July 22, 1918   
ItalyAugust 28, 1916May 23, 1915August 21, 1915October 19, 1915
JapanAugust 23, 1914August 25, 1914  
Liberia **August 7, 1917   
MontenegroAugust 8, 1914August 5, 1914 October 15, 1915
Nicaragua **May 7, 1918May 7, 1918  
Panama **April 7, 1917December 10, 1917  
Peru **October 5, 1917 *   
PortugalMarch 9, 1916March 15, 1916  
RomaniaAugust 28, 1916
November 10, 1918		August 27, 1916August 30, 1916August 30, 1916
RussiaAugust 1, 1914August 6, 1914November 2, 1914October 19, 1915
San Marino ** June 3, 1915  
SerbiaAugust 6, 1914July 28, 1914November 2, 1914October 14, 1915
Siam **July 22, 1917July 22, 1917  
USAApril 6, 1917April 8, 1917April 23, 1917 *April 10, 1917 *
Uruguay **October 7, 1917 *   
* Diplomatic relations were severed.
This was considered equivalent to a declaration of war.
** These countries did not actively participate in hostilities.

Nations - Order of Entering the War

 All NationsDate
1Austria-HungaryJuly 28, 1914
2SerbiaJuly 28, 1914
3GermanyAugust 1, 1914
4RussiaAugust 1, 1914
5FranceAugust 3, 1914
6BelgiumAugust 4, 1914
7British EmpireAugust 4, 1914
8MontenegroAugust 5, 1914
9JapanAugust 23, 1914
10Ottoman EmpireNovember 2, 1914
11ItalyMay 23, 1915
12San Marino **June 3, 1915
13BulgariaOctober 14, 1915
14PortugalMarch 9, 1916
15RomaniaAugust 27, 1916
16USAApril 6, 1917
17Cuba **April 7, 1917
18Panama **April 7, 1917
19Bolivia **April 13, 1917
20GreeceJune 27, 1917
21Siam **July 22, 1917
22Liberia **August 7, 1917
23China **August 13, 1917
24Peru **October 5, 1917
25Uruguay **October 7, 1917
26Brazil **October 26, 1917
27Ecuador **December 8, 1917
28Guatemala **April 22, 1918
29Nicaragua **May 7, 1918
30Costa Rica **May 23, 1918
31Haiti **July 15, 1918
32Honduras **July 22, 1918

Central Empires - Order of Entering the War

 Central EmpiresDate
1Austria-HungaryJuly 28, 1914
2GermanyAugust 1, 1914
3Ottoman EmpireNovember 2, 1914
4BulgariaOctober 14, 1915

Allied Powers - Order of Entering the War

 Allied PowersDate
1SerbiaJuly 28, 1914
2RussiaAugust 1, 1914
3FranceAugust 3, 1914
4BelgiumAugust 4, 1914
5British EmpireAugust 4, 1914
6MontenegroAugust 5, 1914
7JapanAugust 23, 1914
8ItalyMay 23, 1915
9San Marino **June 3, 1915
10PortugalMarch 9, 1916
11RomaniaAugust 27, 1916
12USAApril 6, 1917
13Cuba **April 7, 1917
14Panama **April 7, 1917
15Bolivia **April 13, 1917
16GreeceJune 27, 1917
17Siam **July 22, 1917
18Liberia **August 7, 1917
19China **August 13, 1917
20Peru **October 5, 1917
21Uruguay **October 7, 1917
22Brazil **October 26, 1917
23Ecuador **December 8, 1917
24Guatemala **April 22, 1918
25Nicaragua **May 7, 1918
26Costa Rica **May 23, 1918
27Haiti **July 15, 1918
28Honduras **July 22, 1918
Last Revision: March 4, 2007.
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