A quote from William Pfaff in The New York Review of Books, 14 July 2005
[T]he conventional political wisdom since World War II has identified nationalism with fascism.
Fascism and Nazism both were nationalist historical moments, but
nationalism is not fascism or Nazism. The US at this moment is
arguably the most nationalistic country on earth.
Nationalism is an expression of the intense need for affirmation of national or communal identity as the anchor of individual identity. It is one of the fundamental forces at work in political societies,
giving them meaning. It is also one of the "strong" forces in the
physics of international relations, if not the strongest. It overrides
short-term deviation or distraction. Although it may accompany
high-minded internationalism, it does not readily yield to it; the
repressed returns. For this reason nationalism has to be accommodated,
not stubbornly resisted.
This is the force that has upset the European project and that resists
further EU expansion as well as further concentration of executive
power. The constitution asks a larger sacrifice of national
sovereignty than the French, Dutch, and others are willing to accept.