Political uncertainty in Pakistan, a nuclear power, is more unnerving than it is in most other places. To the east, across the disputed region of Kashmir, lies India, Pakistan's enemy since partition in 1947. To the west, across impenetrable mountain ranges, lies Afghanistan. Somewhere in these mountains, Osama bin Laden is believed to be hiding.

Before Sept. 11, 2001, worries about Pakistan centered mostly on its relationship with India. Since then, Pakistan's western regions have com ...

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