The idea of ​​lasting, ideally global, peace has been in people's minds for centuries. The most notable formulation is the Kantian vision of perpetual peace. “He saw it as a condition that had to be maintained by interstate politics with governments that represented society and the separation of powers. From this basic framework comes the idea called “democratic peace theory” (p. 82). Democratic peace theory (DPT) asserts that democracies generally do not fight other democracies because they share common norms and domestic institutions that prevent international state actors from going to war. Sebastian Rosato states: "In practical terms, democratic peace theory provides the intellectual justification for the belief that the spread of democracy abroad will serve the dual task of strengthening American national security and promoting world peace" ( p.585). DPT is not only wrong, but it doesn't even begin to understand and contain modern terrorism. Democratic peace theory looks brilliant on paper, but when examined closely, its deceptive nature and apparent simplicity become evident. A question that currently divides many experts is that of the definition of democracy and liberalism. Furthermore, there is no concise understanding of liberalism and democracy. Democratic peace theory does not take into account human behavior and perception. This is particularly crucial when it comes to understanding terrorism in its foundations. This essay proposes some systemic flaws in democratic peace theory, as Rosato states: “Democracies generally not fighting other democracies is a false premise; Democracies do not disseminate their standards of domestic politics and conflict resolution and, therefore, do not respect each other when they are in the middle of a paper....tlieb. Washington, DC: CQ Press, 2010. 235-271. Kant, Immanuel Perpetual Peace: A Philosophical Sketch, 1795 via http://www.mtholyoke.edu/acad/intrel/kant/kant1.htm, accessed November 5, 2013 . Locke, John and Peter Laslett. Two government treaties. Cambridge [England: CambridgeUniversity Press, 1988. Print. Owen, John M. “How Liberalism Produces Democratic Peace,” in International Security, Vol.19, No. 2, Fall 1994. Posen, Barry. “Nationalism, the mass army and military power.” International Security 18(1993): 80-124. Print.ROSATO, SÉBASTIEN. “The Erroneous Logic of Democratic Peace Theory.” American Political Science Review 97.4 (2003): 585-602. http://www.jstor.org/stable/3593025. Web.August 8, 2012. Sixty-fifth Congress, 1st Session, Senate Paper No. 5. Via.http://historymatters.gmu.edu/d/4943/, accessed November 5, 2013