Europe is dying. The Washington Post, among others, reports that, within a hundred years, there will be the rare German in Germany or Italian in Italy. Some demographers believe it is too late to correct Europe's plunge into extinction. "The fall in the population can no longer be stopped," reported Walter Rademacher of the German Federal Statistics Office. Replacement fertility rates are 2.1 children per woman in developed nations. No nation in Europe can claim that rate, and most fall under 1.6. At those levels, each generation is barely half the number of the preceding one. The working-age population is...