Columbia subject headings:
Geopolitics--Study and teaching--United States--History--19th century.
Geopolitics--Study and teaching--United States--History--20th century.
Military art and science--United States--History--19th century.
Military art and science--United States--History--20th century.
United States--Military policy.
Harvard subject headings:
Geopolitics--United States.
United States--Foreign relations--20th century.
Princeton subject headings:
Geopolitics--Study and teaching--United States--History--19th century.
Geopolitics--Study and teaching--United States--History--20th century.
Military art and science--United States--History--19th century.
Military art and science--United States--History--20th century.
United States--Military policy.