Columbia subject headings:
Harvard subject headings:
Political campaigns--United States--History--21st century.
Presidents--United States--Election--2016.
United States--Foreign relations--2009-2017.
United States--Military policy.
United States--Politics and government--2009-2017.
Princeton subject headings:
Political campaigns--United States--History--21st century.
Presidents--United States--Election--2016.
United States--Foreign relations--2009-.
United States--Military policy.
United States--Politics and government--2009-.