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Participating Countries

THE NATIONS INVOLVED IN WORLD WAR II

Albania
Declared war on U.S. Dec. 17, 1941

Argentina
Severed diplomatic relations with Bulgaria
Severed diplomatic relations with Hungary
Severed diplomatic relations with Romania
Severed diplomatic relations with Axis satellite government of France Feb. 4, 1944
Declared war on Germany, Japan March 27, 1945

Australia
Declared war on Germany Sept. 3, 1939
Declared war on Italy June 11, 1940
Declared war on Finland, Hungary, Romania Dec. 7, 1941
Declared war on Japan Dec. 8, 1941
Declared war on Bulgaria Jan. 6, 1942
Declared war on Thailand March 2, 1942

Austria
Became involved in the war as a part of Germany, following its annexation by the latter in 1938

Belgium
Invaded by Germany May 10, 1940
Belgian government in exile
Declared war on Italy Nov. 23, 1940
Severed relations with Romania Feb. 12, 1941
Severed relations with Bulgaria March 5, 1941
Severed relations with Finland June 29, 1941
Declared war on Japan Dec. 20, 1941

Bolivia
Declared war on Germany, Italy, Japan, other Axis nations Dec. 4, 1943

Brazil
Declared war on Germany, Italy Aug. 22, 1942
Declared war on Japan June 6, 1945

Bulgaria
Severed relations with Belgium, Netherlands, Poland March 4, 1941
Declared war on Greece, Hungary, Yugoslavia April 24, 1941
Declared war on Soviet Union June 22, 1941
Declared war on U.S., Great Britain Dec. 12, 1941
Declared its neutrality Aug. 26, 1944
Declared war on Germany Sept. 7, 1944
Severed relations with Japan Nov. 10, 1944

Burma
Declared war on U.S., Great Britain Aug. 1, 1943

Canada
Declared war on Germany Sept. 10, 1939
Declared war on Italy June 11, 1940
Declared war on Finland, Hungary, Romania, Japan Dec. 7, 1941
Severed relations with France Nov. 9, 1942

Chile
Severed relations with Germany, Italy Jan. 20, 1943
Severed relations with Bulgaria, Hungary, Romania, France May 18, 1943
Declared war on Japan April 11, 1945

China
Declared war on Germany, Italy, Japan Dec. 9, 1941
Severed relations with France Aug. 1, 1943

Colombia
Severed relations with Japan Dec. 8, 1941
Severed relations with Italy Dec. 19, 1941
Severed relations with France Nov. 26, 1942
Declared war on Germany Nov. 26, 1943

Costa Rica
Declared war on Japan Dec. 8, 1941
Declared war on Germany, Italy Dec. 11, 1941

Croatia
As an Axis-created puppet
Declared war on U.S. Dec. 14, 1941

Cuba
Declared war on Japan Dec. 9, 1941
Declared war on Germany, Italy Dec. 11, 1941
Severed relations with France Nov. 9, 1942

Czechoslovakia
Czech government in exile
Declared war on all nations then at war with U.S., Great Britain, Soviet Union Dec. 16, 1941

Denmark
Invaded by Germany April 8, 1940
Under German occupation
Severed relations with Netherlands May 10, 1940
Severed relations with Belgium, Norway July 15, 1940
Severed relations with Soviet Union June 26, 1941
After surrender of German troops in Denmark
Severed relations with Japan May 17, 1945
Dominican Republic
Declared war on Japan Dec. 8, 1941
Declared war on Germany, Italy Dec. 11, 1941
Severed relations with France Nov. 11, 1942

Ecuador
Severed relations with Germany, Italy, Japan Jan. 29, 1942

Egypt
Severed relations with Italy June 12, 1940
Severed relations with Hungary, Romania Dec. 15, 1941
Severed relations with Bulgaria, Finland Jan. 5, 1942
Severed relations with France Jan. 6, 1942
Declared war on Germany, Japan Feb. 24, 1945

El Salvador
Declared war on Japan Dec. 8, 1941
Declared war on Germany, Italy Dec. 12, 1941
Severed relations with France Nov. 13, 1942

Ethiopia
Declared war on Germany, Italy, Japan Dec. 14, 1942

Finland
Invaded by Soviet Union Nov. 30, 1939
Concluded peace treaty with USSR March 12, 1940
Declared war on Soviet Union June 25, 1941
Declared war on Great Britain Dec. 6, 1941
Severed relations with Hungary, Croatia, Slovakia Sept. 19, 1944
Severed relations with Japan Sept. 22, 1944
Declared war on Germany March 3, 1945

France
Declared war on Germany Sept. 3, 1939
Declared war on Italy June 11, 1940
Capitulated to Germany June 22, 1940
Under German domination
Severed relations with Great Britain July 5, 1940
Severed relations with Belgium, Netherlands, Norway Sept. 5, 1940
Severed relations with Poland Sept. 23, 1940
Severed relations with Soviet Union June 30, 1941
Severed relations with Yugoslavia Aug. 22, 1941
Severed relations with Greece June 30, 1942
Severed relations with U.S. Nov. 8, 1942
Severed relations with Peru Jan. 26, 1943
The Free French National Council, formed in exile on Sept. 23, 1941
Declared war on Germany Dec. 8, 1941

Germany
Invaded Poland Sept. 1, 1939
Invaded Denmark, Norway April 8, 1940
Invaded Netherlands, Belgium, France May 10, 1940
Invaded Greece, Yugoslavia April 6, 1941
Invaded Soviet Union June 22, 1941
Declared war on U.S. Dec. 11, 1941

Great Britain
Declared war on Germany Sept. 3, 1939
Declared war on Italy June 11, 1940
Declared war on Finland, Hungary, Romania, Japan Dec. 7, 1941
Declared war on Bulgaria Dec. 13, 1941
Declared war on Thailand Jan. 25, 1942

Greece
Invaded by Italy Oct. 28, 1940
Invaded by Germany April 6, 1941
Severed relations with Bulgaria, Hungary April 7, 1941
Severed relations with Japan Dec. 7, 1941

Guatemala
Declared war on Japan Dec. 9, 1941
Declared war on Germany, Italy Dec. 11, 1941
Severed relations with France Nov. 12, 1942

Haiti
Declared war on Japan Dec. 8, 1941
Declared war on Germany, Italy Dec. 12, 1941
Declared war on Bulgaria, Hungary, Romania Dec. 24, 1941
Severed relations with France Nov. 10, 1942

Honduras
Declared war on Japan Dec. 8, 1941
Declared war on Germany, Italy Dec. 13, 1941
Severed relations with France Nov. 13, 1942

Hungary
Severed relations with Greece June 24, 1941
Declared war on Soviet Union June 27, 1941
Declared war on U.S. Dec. 13, 1941
Severed relations with Brazil May 2, 1942
Severed relations with Uruguay May 4, 1942
Declared war on Romania Sept. 7, 1944
After signing armistice with Allies
Declared war on Germany Jan. 20, 1945
Iceland
Occupied by British armed forces
Occupied by U.S. forces 1940
July 7, 1941

India
Declared war on Finland, Hungary, Romania Dec. 7, 1941

Iran
Occupied by Great Britain and Soviet Union jointly Aug. 25, 1941
Severed relations with Bulgaria, Hungary, Italy, Romania Sept. 16, 1941
Severed relations with France Feb. 5, 1942
Declared war on Germany Sept. 9, 1943
Declared war on Japan March 1, 1945

Iraq
Severed relations with France Nov. 16, 1941
Declared war on Germany, Italy, Japan Jan. 17, 1943

Italy
Declared war on France, Great Britain June 10, 1940
Invaded Greece Oct. 28, 1940
Declared war on Yugoslavia April 6, 1941
Declared war on Soviet Union June 22, 1941
Declared war on U.S. Dec. 11, 1941
Declared war on Cuba, Guatemala Dec. 13, 1941
After unconditional surrender to Allies on Sept. 8, 1943
Declared war on Germany Oct. 13, 1943
Declared war on Japan July 14, 1945

Japan
Invaded French Indochina Sept. 22, 1940
Severed relations with Poland Oct. 5, 1941
Declared war on U.S., Great Britain, Australia, Canada, New Zealand, South Africa Dec. 7, 1941
Declared war on Netherlands Jan. 11, 1942
Lebanon
Declared war on Germany, Japan Feb. 27, 1945
Liberia
Declared war on Germany, Japan Jan. 27, 1944
Luxembourg
Invaded by Germany May 10, 1940
Severed relations with France Sept. 5, 1940
Manchukuo
As a Japanese puppet state
Declared war on U.S. Dec. 8, 1941

Mexico
Severed relations with Hungary Dec. 19, 1941
Severed relations with Bulgaria Dec. 20, 1941
Declared war on Germany, Italy, Japan May 22, 1942
Severed relations with France Nov. 9, 1942

Mongolian People's Republic
Declared war on Japan Aug. 9, 1945

Netherlands
Invaded by Germany May 10, 1940
Dutch government in exile
Severed relations with Denmark July 15, 1940
Severed relations with Romania Feb. 11, 1941
Severed relations with Bulgaria March 9, 1941
Severed relations with Hungary April 9, 1941
Severed relations with Finland June 28, 1941
Declared war on Japan Dec. 8, 1941
Declared war on Italy Dec. 11, 1941
Netherlands East Indies invaded by Japan Jan. 11, 1942

New Zealand
Declared war on Germany Sept. 3, 1939
Declared war on Italy June 11, 1940
Declared war on Finland, Hungary, Romania Dec. 7, 1941
Declared war on Japan Dec. 8, 1941
Declared war on Bulgaria Dec. 13, 1941
Declared war on Thailand Jan. 25, 1942
Severed relations with France Nov. 17, 1942

Nicaragua
Severed relations with France Dec. 7, 1941
Declared war on Japan Dec. 8, 1941
Declared war on Germany, Italy Dec. 11, 1941
Declared war on Bulgaria, Hungary, Romania Dec. 19, 1941

Norway
Invaded by Germany April 8, 1940
Norwegian government in exile
Severed relations with Italy June 13, 1940
Severed relations with Romania Feb. 21, 1941
Severed relations with Finland Dec. 7, 1941
Severed relations with Japan Dec. 9, 1941

Panama
Declared war on Japan Dec. 7, 1941
Declared war on Germany, Italy Dec. 12, 1941
Severed relations with France Nov. 13, 1942

Paraguay
Severed relations with Italy Jan. 28, 1942
Declared war on Germany, Japan Feb. 7, 1945

Peru
Severed relations with France Jan. 26, 1943
Declared war on Germany, Japan Feb. 12, 1945

Poland
Invaded by Germany Sept. 1, 1939
Invaded by Soviet Union Sept. 17, 1939
Polish government in exile
Severed relations with Romania Nov. 5, 1940
Severed relations with Italy Nov. 13, 1940
Severed relations with Hungary Jan. 1, 1941
Severed relations with Bulgaria March 5, 1941
Declared war on Japan Dec. 11, 1941

Portugal
Gave Great Britain antisubmarine bases in Azores Oct. 12, 1943
Severed relations with Germany May 6, 1945

Romania
Invaded Soviet Union June 22, 1941
Severed relations with Greece June 24, 1941
Declared war on Great Britain Dec. 6, 1941
Declared war on U.S. Dec. 12, 1941
Declared war on Nicaragua Dec. 19, 1941
Declared war on Haiti Dec. 24, 1941
Severed relations with Brazil March 6, 1942
Accepted armistice terms imposed by Allies Aug. 23, 1944
Declared war on Germany Aug. 25, 1944
Declared war on Hungary Sept. 7, 1944
Declared war on Japan March 7, 1945

San Marino
Declared war on Germany Sept. 21, 1944

Saudi Arabia
Declared war on Germany, Japan March 1, 1945

Slovakia
As an Axis-created puppet state
Severed relations with Soviet Union June 22, 1941
Declared war on U.S., Great Britain Dec. 12, 1941

South Africa
Declared war on Germany Sept. 6, 1939
Declared war on Italy June 11, 1940
Declared war on Finland, Hungary, Japan, Romania Dec. 8, 1941
Declared war on Bulgaria Dec. 13, 1941
Declared war on Thailand Jan. 25, 1942
Severed relations with France April 23, 1942

Spain
Severed relations with Japan April 11, 1945

Sweden
Severed relations with Germany May 7, 1945

Syria
Invaded by Great Britain June 8, 1941
Declared war on Germany, Japan Feb. 26, 1945

Thailand
Declared war on U.S., Great Britain Jan. 25, 1942
Voided war declaration Aug. 16, 1945

Turkey
Declared war on Germany, Japan Feb. 23, 1945

USSR
Invaded Poland Sept. 17, 1939
Invaded Finland Nov. 30, 1939
Concluded peace with Finland March 12, 1940
Invaded by Germany, Romania June 22, 1941
Declared war on Bulgaria Sept. 5, 1944
Invaded Romania, Poland, Bulgaria, Yugoslavia (with agreement with anti-Fascist partisans under Marshal Tito), Hungary
Invaded Austria, Czechoslovakia, Germany 1944
1945
Declared war on Japan Aug. 8, 1945

U.S.
Declared war on Japan Dec. 8, 1941
Declared war on Germany, Italy Dec. 11, 1941
Declared war on Bulgaria, Hungary, Romania June 5, 1942
Severed relations with Finland June 30, 1944

Uruguay
Severed relations with Italy Jan. 25, 1942
Severed relations with France May 12, 1943
Declared war on Germany, Japan Feb. 15, 1945

Venezuela
Severed relations with Italy Dec. 31, 1941
Severed relations with France Nov. 27, 1942
Declared war on Germany, Japan Feb. 15, 1945

Yugoslavia
Invaded by Germany April 6, 1941
Invaded by Hungary April 10, 1941
Yugoslav government in exile
Severed relations with Finland Aug. 22, 1941
Declared war on Japan Dec. 7, 1941

PEACE TREATIES AFTER WORLD WAR II
Treaty With By
Peace treaties signed in Paris, Feb. 10, 1947 Italy U.S., Great Britain, USSR, China, France, Australia, Belgium, Brazil, Canada, Czechoslovakia, Ethiopia, Greece, India, Netherlands, New Zealand, Poland, South Africa, Ukrainian SSR, White Russian SSR, and Yugoslavia.

Romania USSR, Great Britain, U.S., Australia, Canada, Czechoslovakia, India, New Zealand, South Africa, Ukrainian SSR, and White Russian SSR.
Bulgaria Same signatories, with the exception of Canada, as with Romania, and with the addition of Greece and Yugoslavia.

Hungary Same signatories as with Romania, and with the addition of Yugoslavia.

Finland Same signatories as with Romania, with the exception of the U.S.

Peace treaty signed in San Francisco, Sept. 8, 1951 Japan Argentina, Australia, Belgium, Bolivia, Brazil, Cambodia, Canada, Ceylon, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, Egypt, El Salvador, Ethiopia, France, Great Britain, Greece, Guatemala, Haiti, Honduras, Indonesia, Iran, Iraq, Laos, Lebanon, Liberia, Luxembourg, Mexico, Netherlands, New Zealand, Nicaragua, Norway, Pakistan, Panama, Paraguay, Peru, Philippines, Saudi Arabia, South Africa, Syria, Turkey, U.S., Uruguay, Venezuela, and Vietnam.

Peace (state) treaty signed in Vienna,
May 15, 1955 Austria France, Great Britain, USSR, and U.S.