To Hyra, it has caused not just 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 renewaltvt体育滚球These 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, a traditional African American neighborhood, is now lined up with hip restaurants and bars in this photo taken on SundayWhites are the tvt体育滚球majority now, accounting for 55 percent of the communityThe same urban renewal is happening in other parts of Washington