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Different countries do it in different ways. In the US, only Congress can do it- but the Constitution doesn't specify exactly how, so it's always been done basically like passing a law. In countries that have a monarch, like Britain or Japan (before World War II), that monarch has the sole power to declare war, but they usually consult their advisors before doing so.

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12y ago

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Officially, Congress must introduce and vote on a measure to declare war. "Officially" that is.

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16y ago
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According to the Constitution only the United States Congress consisting of two houses: the Senate and the House of Representatives can declare war.

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8y ago
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Q: What do you have to do to declare war on another country?
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