According to the Constitution, who is granted the power to declare war?

Congress.

Explanation:

Article I, Section 8, Clause 11 of the U.S. Constitution, sometimes referred to as the War Powers Clause, vests in the Congress the power to declare war, in the following wording:

[The Congress shall have Power ...] To declare War, grant Letters of Marque and Reprisal, and make Rules concerning Captures on Land and Water ...

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