The liberal peace is a political project rooted in the set of ideas and values that sustain liberalism as an ideology. It represents a model through which the west gauges the world by bringing in democracy and by replicating institutions, norms and economic, social and political systems. Thinking about such project implies that there are practical and implementation aspects that cannot be ignored. Liberal peace has been chosen as the theme of this dissertation because it is about a hierarchical relationship between North and South that produces exclusions and marginalizations that happen through peacebuilding operations. This research aims to understand what the real motivations behind the liberal peace project are, by seeking which is its real referent object: the individual who lives in the state being intervened or the western countries national securities? In order to illustrate the findings for such questions, this research has carried out a case study focused on NATO s operations in Afghanistan and the concurring vertiginous growth of opium production in the country. This will lead us to understand what the real referent object behind the liberal peace project after 9/11 is.