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declaration of war
Sign in to saveformal announcement by which one state goes to war against another
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Encyclopedic overview
US President Franklin D. Roosevelt signs a declaration of war against Nazi Germany on 11 December 1941. A declaration of war is a formal act by which one state announces existing or impending war activity against another. The declaration is a performative speech act (or the public signing of a document) by an authorized party of a national government, in order to create a state of war between two or more states.
The legality of who is competent to declare war varies between nations and forms of government. In many nations, that power is given to the head of state or sovereign. In other cases, something short of a full declaration of war, such as a letter of marque or a covert operation, may authorise war-like acts by privateers or mercenaries. The official international protocol for declaring war was defined in the Hague Convention (III) of 1907 on the Opening of Hostilities.
Excerpted from Wikipedia’s “declaration of war” article, available under the CC BY-SA 4.0 licence.
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