Columbia subject headings:
United States--Foreign relations--1913-1921.
United States--Politics and government--1913-1921.
Harvard subject headings:
Isolationism--United States
United States--Foreign relations--1913-1921.
United States--Politics and government--1913-1921.
Princeton subject headings:
United States--Foreign relations--1913-1921.
United States--Politics and government--1913-1921.