Columbia subject headings:
World War, 1914-1918--United States.
World War, 1914-1918.
World politics.
Harvard subject headings:
World War, 1914-1918
World War, 1914-1918--United States
World politics
Princeton subject headings:
World War, 1914-1918--United States.
World War, 1914-1918.
World politics.