Columbia subject headings:
Colombia--History--War of Independence, 1810-1822--Blockades.
Spain--Foreign relations--United States.
United States--Foreign relations--Spain.
Harvard subject headings:
Colombia--History--War of Independence, 1810-1822--Blockades.
Spain--Foreign relations--United States.
United States--Foreign relations--Spain.
Princeton subject headings:
Colombia--History--War of Independence, 1810-1822--Blockade.
Spain--Foreign relations--United States.
United States--Foreign relations--Spain.