Declarations of War during World War II

Timeline of formal Declarations of War during World War II:

1939

 * 1 September 1939 – Operation Himmler (a false flag project designed to justify a German invasion of Poland and accusing the Polish government of persecuting the Volksdeutsche since the Treaty of Versailles in the former German territories of Pomerania, Silesia, East Prussia and West Prussia) culminated in a staged attack on Gleiwitz on 31 August,  which the Third Reich considered an act of war. Germany initiated "Case White", the Poland Campaign.
 * 3 September 1939 – United Kingdom and France declared war on Germany.
 * 3 September 1939 – Australia and New Zealand declared war on Germany.
 * 6 September 1939 – South Africa declared war on Germany.
 * 10 September 1939 – Canada declared war on Germany.

1940

 * 24 April 1940 - Germany declared war on Norway
 * 10 May 1940 – The Netherlands declared war on Germany, after it was "warned" by Germany.
 * 10 June 1940 – Italy declared war on United Kingdom and France.
 * 23 November 1940 – Belgian government in exile declared war on Italy.

1941

 * 25 June 1941 – Finland declared war on the Soviet Union.
 * 27 June 1941 – Hungary declared war on the Soviet Union.
 * 7 December 1941 – Empire of Japan declared war on the United States, United Kingdom, Australia, New Zealand, and South Africa.
 * 7 December 1941 – United Kingdom, Canada, Australia and New Zealand declared war on Finland, Romania and Hungary.
 * 7 December 1941 – Panama declared war on Japan.
 * 8 December 1941 – The United States, United Kingdom, Australia, Costa Rica, The Dominican Republic, El Salvador, Haiti, Honduras, The Netherlands, New Zealand and Nicaragua declare war on Japan.
 * 9 December 1941 – Republic of China declared war on Japan, Italy and Germany.
 * 11 December 1941 – Germany and Italy declared war on the United States.
 * 11 December 1941 – The United States declared war on Germany and Italy.
 * 12 December 1941 – Bulgaria, Hungary, Romania and Slovakia declare war on the United States and United Kingdom.
 * 13 December 1941 – United Kingdom, New Zealand and South Africa declare war on Bulgaria.
 * 14 December 1941 – Croatia declared war on the United States and United Kingdom.
 * 16 December 1941 – Czechoslovak government in exile declares war on all countries at war with the United States, United Kingdom and the Soviet Union.
 * 17 December 1941 – Albania declared war on the United States.
 * 19 December 1941 – Nicaragua declared war on Bulgaria, Hungary and Romania.
 * 20 December 1941 – Belgium declared war on Japan.

1942

 * 6 January 1942 – Australia declared war on Bulgaria.
 * 25 January 1942 – United Kingdom, New Zealand and the Union of South Africa declare war on Thailand.
 * 22 May 1942 – Mexico declared war on Germany, Italy and Japan.
 * 22 August 1942 – Brazil declared war on Germany and Italy.

1943

 * 2 April 1943 – Bolivia declared war on all Axis powers of Axis members.
 * 9 September 1943 – Iran declared war on Germany.
 * 13 October 1943 – Italy (after switching sides) declared war on Germany.

1944

 * 25 August 1944 – Romania (after switching sides) declared war on Germany.
 * 21 September 1944 – San Marino declared war on Germany.

1945

 * 7 February 1945 – Argentina and Paraguay declared war on Germany and Japan.
 * 12 February 1945 – Peru in state of belligerency with Germany and Japan.
 * 15 February 1945 – Venezuela and Uruguay declared war on Germany and Japan.
 * 23 February 1945 – Turkey declared war on Germany and Japan.
 * 24 February 1945 – Egypt declared war on Germany and Japan.
 * 26 February 1945 – Syria declared war on Germany and Japan.
 * 1 March 1945 – Saudi Arabia declared war on Japan.
 * 3 March 1945 – Finland (after switching sides) declared war on Germany.
 * 11 April 1945 – Chile declared war on Japan.
 * 6 July 1945 - Norway declared war on Japan

Literature

 * Adolf Hitler: The Great Tragedy: Germany's Declaration of War against the United States of America, 2012, ISBN 978-1300127703
 * Julia S. Torrie: "For Their Own Good": Civilian Evacuations in Germany and France, 1939-1945, Berghahn Books (2010), ISBN 978-1845457259
 * Nicholas Harman: Dunkirk: the Necessary Myth, Jove (1990), ISBN 978-0340517857
 * German White book