A growing population of nearly half a million Chinese Americans now live on Long Island. Rapidly expanding Chinatowns have developed in Brooklyn and Queens, with Chinese immigrants also moving into Nassau County, as did earlier European immigrants, such as the Irish and Italians. The busy intersection of Main Street, Kissena Boulevard, and 41st Avenue defines the center of Downtown Flushing and the Flushing Chinatown, known as the "Chinese Times Square" or the "Chinese Manhattan". The segment of Main Street between Kissena Boulevard and Roosevelt Avenue, punctuated by the Long Island Rail Road trestle overpass, represents the cultural heart of the Flushing Chinatown. Housing over 30,000 individuals born in China alone, the largest by this metric outside Asia, Flushing has become home to the largest and fastest-growing Chinatown in the world and home to one of the world's busiest pedestrian intersections, as the heart of over 250,000 ethnic Chinese in Queens, representing the largest Chinese population of any U.S. municipality other than New York City in total. Conversely, the Flushing Chinatown has also become the epicenter of organized prostitution in the United States, importing women from China, Korea, Thailand, and Eastern Europe to sustain the underground North American sex trade. Flushing is undergoing rapid gentrification with investment by Chinese transnational entities.