A bit dated, perhaps:

Under Koranic law, jihad in the defense of Islam is the individual duty of every Muslim in the ummah, or worldwide Islamic community. As the United States has either troops, technical personnel, or intelligence agents in Afghanistan, Iraq, Saudi Arabia, Kuwait, Qatar, Turkey, Pakistan, Indonesia, Malaysia, the Philippines, and several former Soviet republics, it is hard to dispute the fact that we have a physical presence in Islamic territory—whatever our reasons—and that is enough to trigger jihad from the ummah, which has repeatedly issued explicit declarations of such.

James Howard Kunstler, The Long Emergency