Why is a president also known as the commander-in-chief

The President is known as Commander in Chief of the Army and is gived the role by the constitution.It is given to the presedint because the president is charged with the responsibility of protecting and defending the United States.

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explanation:

nations must cooperate to bring about and maintain world peace.

nations must not wage wars or commit war crimes in a desire to control other nations.

i think i know which options you have but if these aren't options let me know