U.S. Military Withdrawal and Taliban Takeover in Afghanistan: Frequently Asked Questions [Updated August 27, 2021] [open pdf - 2MB]
From the Summary: "On August 15, 2021, the Taliban entered the Afghan capital of Kabul, completing a rapid takeover over the country with a speed that surprised many Afghans and Americans alike. The Taliban's advance came as the United States was completing the military withdrawal to which it agreed in the February 2020 U.S.-Taliban accord. The fall of the elected Afghan government, supported by billions of dollars in U.S. assistance over the course of nearly two decades, raises significant questions about past, present, and future U.S. policy for Members of Congress. This report provides material related to select questions associated with U.S. policy in Afghanistan, including  Background information useful for understanding the current situation in Afghanistan;  The Taliban takeover and Afghan government's collapse;  U.S. policy implications of the Taliban takeover;  Social and economic implications of the Taliban takeover;  Regional reactions to the Taliban's takeover;  U.S. military operations;  Evacuation of U.S. citizens and some Afghans; and  Budgetary implications of the U.S. withdrawal. [...] The report concludes with some strategic considerations Congress may wish to contemplate as it assesses the situation in Afghanistan and its implications for the future. [...] This report will be updated to reflect major changes in U.S. policy or developments in Afghanistan that may significantly affect U.S. decisions."
CRS Report for Congress, R46879
Congressional Research Service: https://crsreports.congress.gov/