Columbia subject headings:
Great Britain--Colonies--History.
Great Britain--History--18th century.
Great Britain--History--19th century.
Great Britain--History--20th century.
Imperialism--History.
Harvard subject headings:
Great Britain--Colonies--History.
Great Britain--History--18th century.
Great Britain--History--19th century.
Great Britain--History--20th century.
Imperialism--History
Princeton subject headings:
Great Britain--Colonies--History--18th century.
Great Britain--Colonies--History--19th century.
Great Britain--Colonies--History--20th century.
Imperialism--History.