The democratic peace proposition is straight forward, it states: democracies rarely fight each other. Doesn"t say if democracies are less war prone against non democratic areas. This proposition is at the core of liberalism in world politics. Negative freedoms: freedom of conscience, press, speech, key to liberalists. Call for positive freedom, political social and economic rights. Also calls for democratic participation and representation; necessary to guarantee negative and positive freedoms. Liberal democracies do not fight each other precicely because they are democracies. It is the nature of the regime that makes them more peaceful regarding each other. The type of regime is the crucial variable. Run against what we have seen in the first term about the constraint give by the international system. The realists always argue that it is the condition of anarchy that imposes a certain type of behaviour for states. Building of european union is about enlarging the democratic peace theory.