The thesis: "The Causes of Iraqi War: Why the US Administration decided to invade Iraq in 2003" focuses on explanation why the administration of the USA made that step. The specification of the roots of war is based on five causes and seventeen subcauses according to the essay of Stephen Van Evera and other scholars, and the paper trough the methodology of text's analyzes investigates behavior, decision-making process and motivations of the US administration (the level of units) and some steps of the US president G. W. Bush (individual level) in the process leading to the war in Iraq. Concerning the causes of war, the paper introduces different concepts of the offense-defense balance and analyzes whether the balance was disrupted. Secondly, it examines the role of cumulative resources in Iraq like oil, territory and state structures and it shows how they influenced the decision. Third, it searches for the linkage among an emergence of a new threat and responses to it which mouthed to the acceptance of the concept of the first move advantage. Fourth, the thesis accounts for the roots of misperception, where they originate and how they operated in perception of the US administration of the Iraqi threat. Finally, the investigation of the last root of conflict explains why and how windows of...