The Nations Involved in the Great War

Funk & Wagnalls New Encyclopedia - 1983

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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 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


United States

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

Uruguay

Severed relations with Germany Oct 7, 1917

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