During a 20-year civil war, the United Nations Assistance Mission in Afghanistan (UNAMA) has served as a bastion of international support, democratic values, and humanitarian assistance. Highlighting democratization, security, economic assistance, and human rights, we employed over 20 years of United Nations (UN) archives to examine the effectiveness of its mission mandates, and found that UNAMA had reduced child labor and judicial corruption while increasing civil society and facilitating international humanitarian aid. However, UNAMA failed to improve security or establish an inclusive government, particularly with respect to human rights violations. After the US military withdrawal in 2021, the future of UNAMA is contingent upon political negotiations with the Taliban. Only time will tell whether contributions of the mission will persist into the post-conflict era.