Columbia subject headings:
Caribbean Area--Commerce--United States--History--19th century.
Spain--Colonies--America--History--19th century.
Spain--Commerce--United States--History--19th century.
Spain--Commercial policy--History--19th century.
United States--Commerce--Caribbean Area--History--19th century.
United States--Commerce--Spain--History--19th century.
Harvard subject headings:
Princeton subject headings:
Caribbean Area--Commerce--United States--History--19th century.
Spain--Colonies--America--Commerce--History--19th century.
Spain--Commerce--United States--History--19th century.
Spain--Commercial policy--History--19th century.
United States--Commerce--Caribbean Area--History--19th century.
United States--Commerce--Spain--History--19th century.