Joe Biden's gamble: Will pulling troops revive extremist threat?

At its start, America's war in Afghanistan was about retribution for 9/11. Then it was about shoring up a weak government and its weak army so that Osama bin Laden's al-Qaida could never again threaten the United States. Now it's about over.

Joe Biden's gamble: Will pulling troops revive extremist threat?
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At its start, America's war in Afghanistan was about retribution for 9/11. Then it was about shoring up a weak government and its weak army so that Osama bin Laden's al-Qaida could never again threaten the United States. Now it's about over.