Ambassador of the United States
The overall supervisor of diplomatic activities in the United States is the Secretary of State. As of 2014, this is John Kerry.
Department of State
The electorate, or citizenry of said nation.
In 1961 the US ended diplomatic relations with Cuba.
An operations supervisor is someone who directs the activities of a company's department. An operations supervisor can be from a job of any kind to everything from restaurants to retail jobs.
Combatant commanders
The President
combatant commanders
relations
diplomatic
The US switched diplomatic recognition from Taiwan to China in 1979 following the Joint Communiqué on the Establishment of Diplomatic Relations. This move was part of the US government's effort to recognize the People's Republic of China as the sole legal government of China.
The United States Marine Corps is responsible for security of diplomatic missions