The Nations Involved in World War II

Albania

Declared war on U.S.

Dec. 17, 1941

Argentina

Severed diplomatic relations with Bulgaria, Hungary & 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



information from The History Channel: http://www.historychannel.com/worldwartwo/?page=triumph6