The Nations Involved in the Great War

(from the Funk & Wagnalls New Encyclopaedia, 1983, Volume 27, p 418)

Austria-Hungary
  • Declared war on Serbia .........July 28, 1914
  • Declared war on Russia ........Aug 6, 1914
  • Declared war on Belgium ......Aug 28, 1914
  • Declared war on Portugal ......March 15, 1916

    Belgium
  • Refused German ultimatum demanding permission for German troops to cross Belgium Aug 2, 1914
  • Invaded by Germany .........Aug 3-4, 1914

    Bolivia
  • Severed relations with Germany ........April 13, 1917

    Brazil
  • Severed relations with Germany .....April 11, 1917
  • Declared war on Germany .......Oct 26, 1917

    Bulgaria
  • Declared war on Serbia .......Oct 14, 1915
  • Declared war on Romania ......Sept 1, 1916

    China
  • Severed relations with German .....March 14, 1917
  • Declared war on Germany .....Aug 14, 1917
  • Declared war on Austria-Hungary ....Aug 14, 1917

    Costa Rica
  • Severed relations with Germany ....Sept 21, 1917
  • Declared war on Germany ...May 23, 1918

    Cuba
  • Declared war on Germany ....April 7, 1917

    Ecuador
  • Severed relations with Germany ....Dec 8, 1917

    France
  • Invaded by Germany ......Aug 2, 1914
  • Declared war on Austria-Hungary .....Aug 12, 1914
  • Declared war on Turkey ....Nov 5, 1914
  • Declared war on Bulgaria ....Oct 16, 1915

    Germany
  • Declared war on Russia ....Aug 1, 1914
  • Declared war on France ....Aug 3, 1914
  • Declared war on Belgium ....Aug 4, 1914
  • Declared war on Portugal .....March 9, 1916

    Great Britain
  • Declared war on Germany ....Aug 4, 1914
  • Declared war on Austria-Hungary ....Aug 12, 1914
  • Declared war on Turkey ....Nov 5, 1914
  • Declared war on Bulgaria ....Oct 15, 1915

    Greece
  • Declared war on Austria-Hungary, Bulgaria, Germany and Turkey ....June 27, 1917

    Guatemala
  • Declared war on Germany ....April 23, 1918

    Haiti
  • Declared war on Germany ....July 12, 1918

    Honduras
  • Declared war on Germany ....July 19, 1918

    Italy
  • Declared war on Austria-Hungary .....May 23, 1915
  • Declared war on Turkey .....Aug 21, 1915
  • Declared war on Bulgaria .....Oct 19, 1915
  • Declared war on Germany ......Aug 28, 1916

    Japan
  • Declared war on Germany .....Aug 23, 1914
  • Declared war on Austria-Hungary .....Aug 25, 1914

    Liberia
  • Declared war on Germany .....Aug 4, 1914

    Montenegro
  • Declared war on Austria-Hungary ....Aug 5, 1914
  • Declared war on Germany .....Aug 8, 1914
  • Declared war on Bulgaria .....Oct 15, 1915

    Nicaragua
  • Declared war on Germany and Austria-Hungary .....May 8, 1918

    Panama
  • Declared war on Germany ....April 7, 1917
  • Declared war on Austria-Hungary .....Dec 10, 1917

    Peru
  • Severed relations with Germany .....Oct 6, 1917

    Portugal
  • See Germany and Austria-Hungary in this table

    Romania
  • Declared war on Austria-Hungary ....Aug 27, 1916
  • Capitulated to Central Powers by Treaty of Bucharest .....May 7, 1918
  • Re-entered the war on the side of the Allies ....Nov 10, 1918

    Russia
  • Declared war on Turkey .....Nov 2, 1914
  • Declared war on Bulgaria ....Oct 19, 1915

    San Marino
  • Declared war on Austria-Hungary ....June 3, 1915

    Serbia
  • Declared war on Germany .....Aug 6, 1914
  • Declared war on Turkey .....Nov 2, 1914

    Siam
  • Declared war on Germany and Austria-Hungary .....July 22, 1917

    Turkey
  • Declared war on Romania ....Aug 30, 1916
  • Severed relations with the US .....April 23, 1917

    US
  • Declared war on Germany ....April 6, 1917
  • Declared war on Austria-Hungary ....Dec 7, 1917

    Uruguay
  • Severed relations with Germany .....Oct 7, 1917

    Created: Monday, January 20, 1997, 12:55 Last Updated: Monday, January 20, 1997, 12:55