Peace-building over the years have been part of the major arguments of international relations which aims at resolving conflicts, nation building, and the making of important reforms in the different institutions and sectors of the state. It includes strategies that aim at stopping the future reoccurrences of conflict, which is important for the maintenance of global security and protecting the security of the civilians. Iraq entered a new phase of political transition in 2003 after the intervention of US and its allies and the fall of Saddam Hussein. The US intervention in Iraq not only led to the collapse of the regime of Saddam, but also led to the collapse of the Sunni-dominated Iraqi state. The aim of the intervention was to build a liberal state where there is the presence of democracy, human rights, rule of law, and a system where the government is accountable to the citizens of the country. The United States involvement in Iraq can be explained by its role as a hegemonic power to maintain global peace and security because Saddam Hussein was accused to possess weapons of mass destruction that can risk the global security. Through the use of qualitative research method using analytical, descriptive and historical dimensions, the aim of this thesis is to answer two major research questions: (1) Despite the substantial design and implementation of peace building approach, why peace building reached a limited success in Iraq?(2) what are the main obstacles of peace building in Iraq?
Keywords: Peace building, Terrorism, Instruments of peace building, US foreign policy, State building.