Columbia subject headings:
Harvard subject headings:
History, Modern--20th century
History, Modern--21st century
International relations--History
Politics and war.
Revolutions--History
Soviet Union--History--Revolution, 1917-1921--Influence.
Vietnam War, 1961-1975--Influence
War--History
World War, 1914-1918--Influence
World War, 1939-1945--Influence.
World politics--20th century
World politics--21st century
Princeton subject headings:
History, Modern--20th century.
History, Modern--21st century.
International relations--History.
Politics and war.
Revolutions--History.
Soviet Union--History--Revolution, 1917-1921--Influence.
Vietnam War, 1961-1975--Influence.
War--History.
World War, 1914-1918--Influence.
World War, 1939-1945--Influence.
World politics--20th century.
World politics--21st century.