Columbia subject headings:
Illinois--Politics and government.
Spain--Foreign relations--United States.
United States--Foreign relations--Spain.
United States--Politics and government.
Harvard subject headings:
Illinois--Politics and government.
Spain--Foreign relations--United States.
United States--Foreign relations--Spain.
United States--Politics and government.
Princeton subject headings:
Illinois--Politics and government.
Spain--Foreign relations--United States.
United States--Foreign relations--Spain.
United States--Politics and government.