But it is not clear that nationalism represents an irreconcilable contradiction in the heart of liberalism. In the first place, nationalism is not one single phenomenon but several, ranging from mild cultural nostalgia to the highly organized and elaborately articulated doctrine of National Socialism. Only systematic nationalism of the latter sort can qualify as a formal ideology on the level of liberalism or communism. The vast majority of the world's nationalist movements do not have a political program beyond the negative desire of independence from some other group or people, and do not offer anything like a comprehensive agenda for sociology-economic organization. As such, they are compatible with doctrines and ideologies that do offer such agendas. While they may constitute a source of conflict for liberal societies, this conflict does not arise from liberalism itself so much as from the fact that the liberalism in question is incomplete. Certainly a great deal of the world's ethnic and nationalist tension can be explained in terms of peoples who are forced to live in unrepresentative political systems that they have not chosen.