List of States on the Allied or Central Powers Side during World War I

Allies

• Albania
• Andorra
• Armenia(May 1918 onwards)
• Belgium
• Bolivia(April 1917 onwards)
• Brazil(October 1917 onwards)
• British empire(which consists of:

-Australia

-British Crown Colonies

-Canada

-Indian Empire

-New Zealand

-Newfoundland

-South Africa

-United Kingdom of Great Britain and Ireland)

• China(August 1917 onwards)
• Costa Rica(May 1918 onwards)
• Cuba(April 1917 onwards)
• Czechoslovakia
• Ecuador(December 1917 onwards)
• Empire of Japan
• France(including French colonial forces)
• Guatemala(April 1918 onwards)
• Haiti(July 1918 onwards)
• Honduras(July 1918 onwards)
• Kingdom of Greece(May 1917 onwards)
• Kingdom of Italy(April 1915 onwards)
• Kingdom of Montenegro
• Liberia(August 1917 onwards)
• Nicaguara(May 1918 onwards)
• Panama(December 1917 onwards)
• Peru(october 1917 onwards)
• Portugal(including Portugese colonial forces)(March 1916 onwards)
• Romania(August 1916-May 1918)
• Russian empire(until november 1917)
• San Marino(June 1915 onwards)
• Serbia
• Siam(1915 onwards)
• United states of america
• Uruguay(October 1917 onwards)

Central Powers

• Austria-Hungary
• Bulgaria
• Germany
• Turkey