For the United States there are few more strategically important places today than the tribal region of Pakistan, headquarters of al Qaeda and the Pakistani Taliban, and also home to a syndicate of other militant jihadist groups from across Asia.
It is where Faisal Shahzad, who tried to blow up a car bomb in Times Square in May, was trained. So was Najibullah Zazi, the Afghan-American who plotted to explode bombs on Manhattan's subways in 2009. It is also the source of a good deal of the violence that is racking neighboring Afghanistan.