With breathtaking speed, the Taliban have regained control of Afghanistan for the first time since American military forces drove them out 20 years ago. Collapse of the U.S.-backed government triggered panic in Kabul,with many questions about what comes next as the Taliban takes over. We'll talk with Afghan-Americans in California about how they're reacting to the news and we'll look back at the past decades of American military involvement to ask how intelligence so badly underestimated the strength of the Taliban and overestimated the stability of the Afghan government.

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