From the Introduction: "This report provides background information and analysis on U.S. policy in Afghanistan, with a focus on two interrelated developments:  The February 2020 U.S.-Taliban agreement, in which the United States committed to the full withdrawal of international forces by May 2021 in exchange for Taliban counterterrorism assurances.  Intra-Afghan negotiations, which began in Doha, Qatar, in September 2020, but appear to have since stalled, prompting a renewed U.S. diplomatic effort, including a planned senior-level meeting in Turkey in April 2021 aimed at reaching a political settlement to end the war and a U.S.-drafted peace proposal. The report also provides information on security dynamics related to the ongoing conflict and related questions about the future of the United States' military presence and U.S. investment in development and security aid to Afghanistan (which has totaled more than $143 billion since 2001)."
CRS Report for Congress, R45122
Congressional Research Service: https://crsreports.congress.gov/