Rising ranks of US rich highlight social dilemma A booming US economy has led to an explosion in the ranks of the wealthy unseen in a century, creating a surging market for luxury goods as well as a new era of philanthropy, researchers say. Immigrants behind 25 percent of startups Foreign-born entrepreneurs were behind one in four U.S. technology startups over the past decade, according to a study to be published Thursday. Princeton number 1 in college rankings Princeton takes the top spot in the latest U.S. News & World Report college rankings, breaking a three-year tie for No. 1 with Ivy League rival Harvard.