Columbia subject headings:
Mexico--Foreign relations--United States.
Mexico--History--European intervention, 1861-1867--Sources.
United States--Foreign relations--Mexico.
Harvard subject headings:
Mexico--Foreign relations--United States.
Mexico--History--European intervention, 1861-1867--Sources.
United States--Foreign relations--Mexico.
Princeton subject headings:
Mexico--Foreign relations--United States.
Mexico--History--European intervention, 1861-1867--Sources.
United States--Foreign relations--Mexico.