Know the Facts? Al-Qaeda Marks 20 Years of Terror

Twenty years ago this week, Osama bin Laden and his cohorts founded the infamous militant group al-Qaeda. For two decades the terrorist network has sought to end foreign influence in Muslim countries, kill US citizens and their allies everywhere, and create a perfect Islamic form of government in the Muslim world.

The past 20 years have seen many gruesome al-Qaeda successes, but the group also faces feasible fragmentation and failure in the future. Do you know the facts on America's main enemy in the war on terrorism?