Poland Declared War on Germany at | Midnight 31st August - 1st Sept 1939. [See the German White Book] | |
Great Britain on Germany | September 3, 1939, 11 a.m. | |
France on Germany | September 3, 1939, 5 p.m. | |
India on Germany | September 3, 1939 | |
Australia on Germany | September 3, 1939 | |
New Zealand on Germany | September 3, 1939 | |
Union of South Africa on Germany | September 6, 1939 | |
Canada on Germany | September 10, 1939 | |
Norway and Germany | No formal declaration of war | |
Belgium and Germany | No formal declaration of war | |
Luxembourg and Germany | No formal declaration of war | |
The Netherlands on Germany | May 10, 1940 | |
Italy on France | June 10, 1940 | |
Canada on Italy | June 10, 1940 | |
New Zealand on Italy | June 11, 1940 | |
Australia on Italy | June 11, 1940 | |
Union of South Africa on Italy | June 11, 1940 | |
Greece on Italy | October 28,1940 | |
Germany and Greece | No formal declaration of war | |
Germany on Yugoslavia | April 6, 1941 | |
Italy and Yugoslavia | No formal declaration of war | |
Yugoslavia on Bulgaria | April 6, 1941 | |
Yugoslavia on Hungary | April 10, 1941 | |
Bulgaria on Greece | April 24, 1941 | |
Bulgaria on Yugoslavia | April 24, 1941 | |
Germany on USSR | June 22, 1941 | |
Italy on USSR | June 22, 1941 | |
Rumania on USSR | No formal declaration of war | |
Finland on USSR | No formal declaration of war | |
Hungary on USSR | June 27, 1941 | |
Great Britain on Rumania | December 7, 1941 | |
Great Britain on Hungary | December 7, 1941 | |
Canada on Finland | December 7, 1941 | |
Canada on Rumania | December 7, 1941 | |
Canada on Hungary | December 7, 1941 | |
Australia on Finland | December 8, 1941 | |
Australia on Rumania | December 8, 1941 | |
Australia on Hungary | December 8, 1941 | |
Union of South Africa on Finland | December 8, 1941 | |
Union of South Africa on Rumania | December 8, 1941 | |
Union of South Africa on Hungary | December 8, 1941 | |
New Zealand on Finland | December 7, 1941 | |
New Zealand on Hungary | December 7, 1941 | |
New Zealand on Rumania | December 7, 1941 | |
Japan on the United States | December 7, 1941 | |
Japan on the British Empire | December 7, 1941 | |
Great Britain on Japan | December 8, 1941 | |
The United States on Japan | December 8, 1941 | |
Canada on Japan | December 8, 1941, as of December 7, 1941 | |
Costa Rica on Japan | December 8, 1941 | |
Dominican Republic on Japan | December 8, 1941 | |
Guatemala on Japan | December 8, 1941 | |
Haiti on Japan | December 8, 1941 | |
Honduras on Japan | December 8, 1941 | |
El Salvador on Japan | December 8, 1941 | |
Panama on Japan | December 8, 1941 | |
Cuba on Japan | December 9, 1941 | |
The Netherlands on Japan | December 8, 1941 | |
The Netherlands Indies on Japan | December 8, 1941 | |
China on Japan | December 9, 1941 | |
China on Germany | December 9, 1941 | |
China on Italy | December 9, 1941 | |
Union of South Africa on Japan | December 8, 1941 | |
Australia on Japan | December 8, 1941 | |
Free France on Japan | December 8, 1941 | |
Germany on the United States | December 11, 1941 | |
Italy on the United States | December 11, 1941 | |
The United States on Germany | December 11, 1941 | |
The United States on Italy | December 11, 1941 | |
Costa Rica on Germany and Italy | December 11, 1941 | |
Guatemala on Germany and Italy | December 11, 1941 | |
Cuba on Germany and Italy | December 11, 1941 | |
Nicaragua on Germany, Italy and Japan | December 11, 1941 | |
Poland on Japan | December 11, 1941 | |
Dominican Republic on Germany and Italy | December 11, 1941 | |
Haiti on Germany and Italy | December 12, 1941 | |
Honduras on Germany and Italy | December 12, 1941 | |
El Salvador on Germany and Italy | December 12, 1941 | |
Panama on Germany and Italy | December 12, 1941 | |
Rumania on the United States | December 12, 1941 | |
Bulgaria on the United States | December 13, 1941 | |
Bulgaria on Great Britain | December 13, 1941 | |
Hungary on the United States | December 13, 1941 | |
Czechoslovakia on all countries that are in a state of war with Great Britain, theUnited States, or the USSR |
December 16, 1941 | |
Albania on the United States | December 17, 1941 | |
Nicaragua on Bulgaria, Hungary, & Rumania | December 20, 1941 | |
Belgium on Japan | December 20, 1941 | |
Haiti on Bulgaria, Hungary, and Rumania | December 24, 1941 | |
Great Britain on Bulgaria | December 27, 1941, as of December 13, 1941 | |
The Netherlands on Italy | December 30, 1941, as of December 11, 1941 | |
Union of South Africa on Bulgaria | December 31, 1941, as of December 13, 1941 |