Columbia subject headings:
Europe--Foreign relations--1871-1918.
Europe--Foreign relations--1918-1945.
World politics--1900-1945.
World politics--19th century.
Harvard subject headings:
Great Britain--Foreign relations--1837-1901.
Great Britain--Foreign relations--20th century.
Great Britain--History--20th century.
Great Britain--History--Victoria, 1837-1901
International relations
Military history, Modern--19th century
Military history, Modern--20th century
Military policy.
World politics--20th century
Princeton subject headings: