Briefly describe gentrification in the United States

What will be an ideal response?

An ideal response would be:
Recently, many of the once-declining central cities have shown signs of rejuvenation and gentrification. Gentrification in an area refers to relatively wealthier people buying property in poorer areas of a city and moving there, which results in revitalization of the area and increased property values but is often accompanied by displacing the poor. Cities such as Atlanta, Kansas City, and Newark, which were losing population a decade or two ago, are now gaining new residents. Gentrification has attracted some suburbanites to come back to central cities. Some of the large city population increase may be the result of the late-2000s recession but large cities are also attractive places for young people to live and work.