Columbia subject headings:
Neutrality--United States.
NeutralityzUnited States.
United States--Foreign relations--1913-1921.
World War, 1914-1918--United States.
Harvard subject headings:
Neutrality--United States.
United States--Foreign relations--1913-1921.
World War, 1914-1918--United States
Princeton subject headings:
Neutrality--United States.
United States--Foreign relations--1913-1921.
World War, 1914-1918--United States.