The emotional impact on Europe is profound. On the long journey from the ruins of 1945 to a prosperous continent whole and free, America was central. President John F. Kennedy’s “Ich bin ein Berliner” speech in 1963 framed the fortitude of West Berlin as an inspiration to freedom seekers everywhere. President Ronald Reagan issued his challenge — “Mr. Gorbachev, tear down this wall!” — at the Brandenburg Gate in 1987. European history has also been America’s history as a European power.

But the meaning of “the West” in this dawning era is already unclear. For many years, despite sometimes acute Euro-American tensions, it denoted a single strategic actor united in its commitment to the values of liberal democracy.

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