Columbia subject headings:
Canada--Foreign relations--United States.
Canada--History--1841-1867.
United States--Foreign relations--1861-1865.
United States--Foreign relations--Canada.
Harvard subject headings:
Canada--Foreign relations--United States.
Canada--History--1841-1867.
United States--Foreign relations--1861-1865.
United States--Foreign relations--Canada.
Princeton subject headings:
Canada--Foreign relations--United States.
United States--Foreign relations--1861-1865.
United States--Foreign relations--Canada.