Courtesy Reuters

Once again we have reached a major turning point in American foreign policy. On this, at least, there is widespread agreement. The conviction that the nation has come to a critical juncture in its foreign relations is broadly shared by those who may disagree on virtually everything else. Everywhere the signs point to the conclusion that for the third time in the post-World War II period we are in the throes of far-reaching change in the nation's foreign policy. What these signs do not divulge are the eventual scope and magnitude of the change.

Yet the same was true of

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