Columbia subject headings:
Neutrality--United States.
United States--Politics and government--1913-1921.
World War, 1914-1918.
Harvard subject headings:
Neutrality--United States.
United States--Politics and government--1913-1921.
World War, 1914-1918
Princeton subject headings:
Neutrality--United States.
United States--Politics and government--1913-1921.
World War, 1914-1918.