World War I
41 countries took part.
Read about World War I on Wikipedia
| Country | Years |
|---|---|
 Australia
|
1914 to 1918 |
 Austria
|
1914 to 1918 |
 Belgium
|
1914 to 1918 |
 Bosnia and Herzegovina
|
1914 to 1918 |
 Brazil
|
1914 to 1918 |
 Bulgaria
|
1914 to 1918 |
 Canada
|
1914 to 1918 |
 Croatia
|
1914 to 1918 |
 Cuba
|
1914 to 1918 |
 Czech Republic
|
1914 to 1918 |
 France
|
1914 to 1918 |
 Germany
|
1914 to 1918 |
 Greece
|
1914 to 1918 |
 Hungary
|
1914 to 1918 |
 India
|
1914 to 1918 |
 Iraq
|
1914 to 1918 |
 Israel
|
1914 to 1918 |
 Italy
|
1914 to 1918 |
 Japan
|
1914 to 1918 |
 Jordan
|
1914 to 1918 |
 Lebanon
|
1914 to 1918 |
 Liberia
|
1914 to 1918 |
 Montenegro
|
1914 to 1918 |
 New Zealand
|
1914 to 1918 |
 Panama
|
1914 to 1918 |
 People's Republic of China
|
1914 to 1918 |
 Poland
|
1914 to 1918 |
 Portugal
|
1914 to 1918 |
 Romania
|
1914 to 1918 |
 Russia
|
1914 to 1918 |
 Saudi Arabia
|
1914 to 1918 |
 Serbia
|
1914 to 1918 |
 Slovakia
|
1914 to 1918 |
 Slovenia
|
1914 to 1918 |
 South Africa
|
1914 to 1918 |
 Syria
|
1914 to 1918 |
 Thailand
|
1914 to 1918 |
 Turkey
|
1914 to 1918 |
 Ukraine
|
1914 to 1918 |
 United Kingdom
|
1914 to 1918 |
 United States
|
1914 to 1918 |