When a multiethnic society can be defined multicultural? The analysis proposed in this book aims to contribute to the understanding of integration policies, of trends and their effects on social, economic and political , and the influence they have on migration politics. The analysis is also based on the political and cultural debate regarding the failure (or decline) of Western models of integration. The ipothesis supported in this work is that the alleged failure of multiculturalism on the basis of ethnicity, especially in Europe, reflecting a social political crisis of the western countries, that being immature to develop postmodern values of coexistence between each other; on the one hand stimulate the construction of the enemy and on the other hand stimulate trends of defence of territory and identity. The questions analyzed are: If the European countries are faced with a crisis of the liberal socio-political model of respect for minorities and human rights. And why despite the difficulties of integration whose outcomes alternate between marginality and exclusion some people continue to migrate?