With American Troops Departing, What Comes Next For Afghanistan?

On April 14th President Biden announced that American Troops will be leaving Afghanistan by September 11, 2021, formally ending US military engagement after twenty years of war. What contributed to this decision? What impact will it have on internal dynamics in Afghanistan and does this mean the Taliban will gain control?  On the line with me to discuss the implications of the decision to end US military presence in Afghanistan is Adam Weinstein,  Research Fellow at the Quincy Institute for Responsible Statecraft