The paper defends the notion that cosmopolitanism is an important starting point for addressing political identities, but one that needs to be rethought. The paper starts by exposing some political situations both in Europe and in North America where the debate on national identity is faced with the need for a renewed idea of cosmopolitanism, an idea that must be differentiated from similar notions such as cultural diversity or multiculturalism, but also from the idea of globalization. It shows in this sense that there is an important and often forgotten difference between cosmopolitanism and politics, an essential difference when thinking about the real situation in Europe. The paper explains how contemporary cosmopolitanism has its roots ...