[R]acial difference and ethnic pride are no longer just fossilized notions from the 1960s; they are growing fissures in the American mosaic that now threaten to split the country apart - fueling the suspicion of less liberal and more homogeneous nations that the great American experiment will finally unwind as expected. That would be a great tragedy, but a catastrophe entirely predictable if citizens seek symbolic solidarity with their tribe rather than in the common idea of just being American.