Columbia subject headings:
Harvard subject headings:
Brazil--Foreign relations--Portugal.
Brazil--History--1763-1822.
Brazil--History--Empire, 1822-1889.
Portugal--Foreign relations--Brazil.
Portugal--History--John VI, 1816-1826.
Portugal--History--Maria I, 1777-1816.
Princeton subject headings:
Brazil--Foreign relations--Portugal.
Brazil--History--Empire, 1822-1889.
Brazil--History--To 1822.
Portugal--Foreign relations--19th century.
Portugal--Foreign relations--Brazil.