World War 2 Countries

Axis Powers (signers of the Tripartite Treaty)

Germany
Italy
Japan

Co-signers of the Tripartite Treaty

Bulgaria (March 1st, 1941)
Hungary (November 20th, 1940)
Romania (November 23rd, 1940)
Slovakia(1) (November 24th, 1940)

Countries that were annexed by, or at war with, Axis Powers before the World War II

Austria (annexed to Germany, "Anschluss", March 13th, 1938)
Ethiopia (annexed by Italy in 1936, after the Abyssinia crisis, independence restored in 1941)
Republic of China (at war with Japan since 1931)

Allied Powers

Australia
Brazil
Canada
Newfoundland
New Zealand
South Africa
Soviet Union (from June 1941)
United Kingdom
United States (from December 1941)

Supporters of the Allies

Argentina
Bolivia
Chile
Colombia
Costa Rica
Cuba
Dominican Republic
Ecuador
Egypt(2)
El Salvador
Guatemala
Haiti
Honduras
Iraq
Lebanon
Liberia
Mexico
Mongolia
Nicaragua
Panama
Paraguay
Peru
Saudi Arabia
Turkey
Uruguay
Venezuela

Countries that were attacked, occupied, or switched sides during the war (Most countries below had declared their neutrality before being assaulted.)

Algeria
Albania (occupied by Italy April 7th 1939, by Germany September 26th 1943)
Belgium (invaded by Germany May 10th 1940)
Burma
Czechoslovakia(1) (Bohemia and Moravia occupied by Germany March 15th 1939)
Denmark (occupied by Germany April 9th 1940, Greenland occupied by USA April 9th 1941)
Estonia (occupied by the Soviet Union from June 18th 1940, by Germany September 5th 1941, re-annexed by the Soviet Union in 1944)
Finland (attacked by the Soviet Union November 30th 1939 and June 26th 1941)
France (surrendered to Germany June 22nd 1940)
Greece (invaded by Italy October 28th 1940, German occupation from April 6th 1941)
Iceland (occupied by Great Britain May 10th 1940, by USA from July 1941)
India
Iran
Latvia (occupied by the Soviet Union from June 18th 1940, by Germany June 25th 1941, re-annexed by the Soviet Union in 1944)
Lithuania (occupied by the Soviet Union from June 18th 1940, by Germany June 22nd 1941, re-annexed by the Soviet Union in 1944)
Luxembourg (invaded by Germany May 10th 1940)
Morocco
The Netherlands (invaded by Germany May 10th 1940)
New Guinea
Norway (invaded by Germany April 9th 1940)
Philippines
Poland (invaded by Germany and the Soviet Union in September 1939)
Singapore
Syria
Thailand
Tunisia (Occupied by USA in 1943)
Yugoslavia(3) (German occupation from April 6th 1941)

Countries that remained nominally neutral

Ireland
Portugal
Spain
Sweden (with exception for the Winter War)
Switzerland

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