We’ve been told over the years that the world, and America, is becoming overcrowded. But more recently, it’s been proven that those guesses were quite wrong, and in fact, U.S. population is on the verge of shrinking. Jonathan Last, author of What to Expect When No One’s Expecting, says that the danger we face isn’t overpopulation, but underpopulation. Without a growing population, we confront a drastic change in our culture, politics and society. The trend will be hard to reverse.