Columbia subject headings:
Harvard subject headings:
Korea--Foreign relations--United States.
Korean reunification question (1945-  )
United States--Foreign relations--1945-1989.
United States--Foreign relations--1989-
United States--Foreign relations--Korea.
Princeton subject headings:
Korea (North)--Foreign relations--United States.
Korea (South)--Foreign relations--United States.
United States--Foreign relations--Korea (North)
United States--Foreign relations--Korea (South)