Political Demography is a collection of essays that shows some of the results of the new research in more detail. A chapter by Mark Haas of Duquesne University in Pittsburgh argues that demographic change will consolidate America's strategic position because all other leading nations have such dire demographic trends. China's one-child policy means there is a shortage of women of child-bearing age. As a result, between now and 2050 the number of men in China aged 20 to 25 (ie, of prime military recruiting age) will halve. Similarly, points out Eric Kaufmann, in many countries, fundamentalist religious groups have fertility rates two or three times higher than the societies in which they live. Israel is a good example. Over time, this will alter the balance of power in those countries.
The Economist