What is the mission of the U.S. Department of State?

The Harry S Truman Building, Department of State headquaters in Washington D.C.

The Harry S Truman Building, Department of State
headquaters in Washington D.C. (© AP Photo/J. Scott Applewhite)

The Department of State is the United States government’s oldest cabinet level federal agency. The mission of the Department of State is to represent America’s foreign policy abroad, and to advance the interests and security of the American people.

The Department of State leads America’s foreign policy through diplomacy, advocacy, and assistance by advancing the interests of the American people, their safety and economic prosperity.