The Rhone River Valley in southern France is a storybook marriage of high technology, traditional vineyards, and ancestral villages. High-speed trains and well-designed toll roads crisscross majestic cathedrals, castles, and chateaus.

Traveling in a Europe at peace these days evokes both historical and literary allusions. As with the infrastructure and engineering of the late Roman Empire right before its erosion, the Continent rests at its pinnacle of technological achievement.

There is a Roman Empire-like sameness throughout Europe in fashion, popular culture, and government protocol — a welcome change from the deadly fault lines of 1914 and 1939.

Yet, as in the waning days of Rome, there is a growing uncertainly beneath the European calm.

The present generation has inherited the physical architecture and art of a once-great West — cathedrals, theaters, and museums. But it seems to lack the confidence that it could ever create the conditions to match, much less exceed, such achievement. ...