Columbia subject headings:
Great powers.
Rome--Foreign relations.
Rome--Politics and government--510-30 B.C.
United States--Foreign relations.
United States--Politics and government.
Harvard subject headings:
Great powers.
Rome--Foreign relations.
Rome--Politics and government--510 B.C.-30 B.C.
United States--Foreign relations.
United States--Politics and government.
Princeton subject headings:
Great powers.
Rome--Foreign relations.
Rome--Politics and government--510-30 B.C.
United States--Foreign relations--History.
United States--Politics and government.