Columbia subject headings:
Democracy.
September 11 Terrorist Attacks, 2001.
Terrorism.
Harvard subject headings:
September 11 Terrorist Attacks, 2001
Terrorism--Government policy--United States
United States--Foreign public opinion.
United States--Foreign relations--2001-2009.
War on Terrorism, 2001-2009
Princeton subject headings:
Democracy.
September 11 Terrorist Attacks, 2001.
Terrorism.