This thesis examines the role of the United Nations in post-conflict reconstruction efforts in Bosnia and Liberia, two countries that have experienced intrastate wars. The United Nations, a liberal western institution, has been a key actor in the reconstruction process of both nations.This study utilises the framework of implementation theory to analyse the implementation process of the UN post-conflict reconstruction efforts. By comparing, the methods and strategies of the UN in promoting democratisation and marketisation in post-war environments. The findings show analysis needs conducted by the UN structures, planning of projects to implement a free-market economy, and democratic institutions and reforms. The findings contribute to a deeper understanding of the rationale behind the implementation of post-conflict reconstruction efforts and provide insights into their outcomes.