It took the United States 139 years to get to 100 million people, and just 52 years to add another 100 million, back in 1967. Now, one day in October-after an interval of just 39 years-America will claim more than 300 million souls. The moment will be hailed as another symbol of America's boundless energy and unique vitality. It is that, of course. But it is also true America has grown every time the Census Bureau has taken a measurement, starting in 1790, when the Founders counted fewer than 4 million of their countrymen-about half the population of New York City today.
The recent growth surge has been extraordinary. Since 2000 alone, the nation has added some 20 million people. Compared with western Europe, with birth rates plunging, or Japan, its population shrinking, America knows only growth, growth, and more growth. It now has the third-largest population in the world, after China and India. "Growth is a concern that we have to manage," says Kenneth Prewitt, former head of the Census Bureau, "but it's much easier to manage than losing your population."
U.S. News & World Report examines the ramifications of the population increase.