Columbia subject headings:
Harvard subject headings:
Cuban question--To 1895.
Polk, James K. (James Knox), 1795-1849.
Spain--Foreign relations--United States.
United States--Foreign relations--Spain.
United States--Politics and government--1845-1849.
Princeton subject headings:
Cuban question--To 1895.
Polk, James K. (James Knox), 1795-1849.
Spain--Foreign relations--United States.
United States--Foreign relations--Spain.
United States--Politics and government--1845-1849.