According to the democratic peace theory, democratic states are less likely to go to war with other democratic states. Consequently, the ultimate goal of the theory is to create a world of democracies that is, a world without war. However, from the realist perspective in some cases democracies go to war with other democracies to influence their power. This paper will critically analyze the validity of democratic peace theory in its assumption that democracies rarely fight each other, by providing the example of the establishment of the European Union, in which democracies are co-operating with each other to achieve their common good. The paper is divided into three parts; the first one will provide an explanation of the Peace Democratic theory and its main assumptions. The second one will evaluate to what extent these assumptions are practical ones through the application of the case studies. Then a counter-argument for one of its assumption will be included questioning the core claim of the democratic peace theory from the commercial peace theory perspective.
Key words: Democracy, peace theory, war, co-operation.
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