an Entity references as follows:
New York City has seen a cycle of modest boom and a bust in the 1980s, a major boom in the 1990s, and mixed prospects since then. This period has seen severe racial tension, a dramatic spike and fall of crime rates, and a major influx of immigrants growing the city's population past the eight million mark. The September 11 attacks on the World Trade Center in 2001 had a lasting impact on the city that continues to reverberate to the present.