Columbia subject headings:
Democracy.
National security--United States.
Security, International.
Strategy.
Terrorism--United States--Prevention.
United States--Foreign relations--21st century.
Harvard subject headings:
Democracy
Globalization--21st century.
International cooperation.
National security--21st century.
National security--United States--21st century.
Security, International--21st century.
Strategy
Terrorism--United States--Prevention
Princeton subject headings:
Democracy.
Globalization--21st century.
International cooperation.
National security--21st century.
National security--United States--21st century.
Security, International--21st century.
Strategy.
Terrorism--United States--Prevention.