Kabul fell to the Taliban in August 2021 despite peace talk efforts in late 2020 and early 2021. International pundits had been predicting that Ashraf Ghani’s government might need to share power with a resurgent Taliban, but none had expected such a swift and complete takeover as the Americans readied to leave for good. Two decades of international intervention in Afghanistan were erased. The efficacy and desirability of intervention has been thrown into serious doubt, and with it the prospects for post-conflict state-building. This chapter introduces the rise, and possible fall, of the post-conflict state-building agenda. It introduces the reader to important concepts, noting the relationships between state-building, peace-building and nation-building, as well as underscoring the role of liberal ideology in shaping post-conflict state-building efforts, asking readers to reflect on what they believe external actors should, or should not, do.