To the unaware, Port St. Lucie might look like a rather nondescript Florida town, sprawling and sedate – a suburb in search of a city with nothing that resembled a downtown until developers built one about two decades ago. But that might be its genius. According to a recent study, only two of 113 of the largest cities in the United States qualify as integrated. And one is Port St. Lucie. (The other is Colorado Springs, Colorado.) Even as America's major metropolitan regions become more diverse, the country has begun to resegregate into more racially homogeneous neighborhoods. More than 80 percent of the nation's major metropolitan areas are more racially segregated today than they were in 1990, the study by researchers at the University of California, Berkeley found. The trend is of momentous importance. Throughout American history, racially segregated neighborhoods have been a fundamental driver of profound racial disparities in education, policing, health care, and income.