Question

The executive department that deals most with foreign countries is

Answer 1

The executive department that deals most with foreign countries is the "State Department", which is headed by the Secretary of State--a position that is appointed by the President. 

Answer 2

The executive department that deals most with foreign countries is the State Department. Its function is to advice the president; represent the country in international affairs as well as to manage  the nation in foreign policy issues. Further functions of the State Department are: to represent the United States at the United Nations, to negotiate agreements and treaties with foreign entities; and to  implement the foreign policy of the United States. Its head is the Secretary of States who is appointed by the President of the Nation and confirmed by the Senate.