Which person or group gives commands to the military, and which person or group has the power to declare war?

Constitution of the United States, Article I, Section 8: Gives Congress the power to declare war and raise and support the armed forces.

Explanation:

Congress.

Explanation:

Through Article I Section 8, Congress can command the military, though the president can as well, but Congress has the the power to raise new divisions and declare war. Another thing, the president can use the armed forces without permission for 90 days.

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Explanation: