The area, a 90 percent black neighborhood just a few decades ago, was only 30 percent African American by 2010To Hyra, it has caused not just residential displacement for African Americans but also political and cultural displacement英亚appHe saw major issues of gentrification and segregation in Washington beneath the surface of rapid urban renewalThese changes may look pleasant, but not quite so to Derek Hyra, an associate professor at the American University School of Public Affairs and an expert on neighborhood changeThe 14th Street near U Street, 英亚appa traditional African American neighborhood, is now lined up with hip restaurants and bars in this photo taken on SundayWhites are the majority now, accounting for 55 percent of the community