Columbia subject headings:
Great Britain--Territories and possessions--History.
Imperialism.
United States--Foreign relations.
United States--Territories and possessions--History.
Harvard subject headings:
Globalization--Political aspects--History.
Great Britain--Territories and possessions--History.
United States--Foreign relations.
United States--Insular possessions--History.
United States--Territorial expansion.
United States--Territories and possessions--History.
Princeton subject headings:
United States--Territories and possessions--History.