Columbia subject headings:
Harvard subject headings:
IS (Organization)
Islamic fundamentalism
Middle East--Foreign relations--United States.
United States--Foreign relations--Middle East.
Princeton subject headings:
IS (Organization)
Islam--21st century.
Islamic fundamentalism.
Jihad.
Middle East--Foreign relations--United States.
Security, International.
Terrorism--Religious aspects--Islam.
United States--Foreign relations--Middle East.
War--Religious aspects--Islam.