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蒙特卡罗官方 residential displacement for African Americans but also political and cultural displacementHe 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, 蒙特卡罗官方a 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