In the years after the United States enacted the Immigration and Nationality Act of 1965, allowing many more immigrants from Asia into the country, the population of Chinatown increased dramatically. Geographically, much of the growth occurred in neighborhoods to the north. The Chinatown grew and became more oriented toward families due to the lifting of restrictions. In the earliest years of the existence of Manhattan's Chinatown, it had been primarily populated by Taishanese-speaking Chinese immigrants and the borderlines of the enclave was originally Canal Street to the north, Bowery to the east, Worth Street to the south, and Mulberry Street to the west.