The Department of State is

 The US Department of State functions as the diplomatic wing of the federal government, handling matters of foreign affairs with other nations and international bodies. The State Department's primary job is to promote American foreign policy throughout the world.

  The United States Department of State (DOS), commonly referred to as the State Department, is a federal executive department responsible for carrying out U.S. foreign policy and international relations.

Explanation:

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

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