The United States population is about to hit a major milestone. Sunday, probably, the U.S. will hit 300 million in population, a mark reached less than 40 years after our numbers reached 200 million. Fairly soon, "One nation, over-crowded" could soon be the new pledge of allegiance, as the U.S. grows, and grows, and grows. It's as much about immigration as it is the birth rate; but at any rate, we are gaining a new American approximately every ten seconds. Have you given thought to what that means? We will - Wednesday morning at nine on The Sound of Ideas from 90.3.David Giffels, columnist, Beacon Journal; Heather Royer, PhD, economist, Case Western Reserve U.; Ben Wisener, visiting professor, Environmental Studies, Oberlin College