Columbia subject headings:
Great Britain--Foreign relations--19th century.
Great Britain--Foreign relations--20th century.
Imperialism.
United States--Foreign relations.
Harvard subject headings:
Great Britain--Foreign relations--19th century.
Great Britain--Foreign relations--20th century.
Imperialism.
United States--Foreign relations.
Princeton subject headings:
Great Britain--Foreign relations--19th century.
Great Britain--Foreign relations--20th century.
Imperialism.
United States--Foreign relations.