At some point in the course of the decades, what had seemed in 1964 to be merely an ambitious reform revealed itself to have been something more. The changes of the 1960s, with civil rights at their core, were not just a major new element in the Constitution. They were a rival constitution, with which the original one was frequently incompatible—and the incompatibility would worsen as the civil rights regime was built out. Much of what we have called “polarization” or “incivility” in recent years is something more grave—it is the disagreement over which of the two constitutions shall prevail:
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