New York wrested the title of ethnic-diversity capital of the United States from Los Angeles over the past decade, census figures show. That change may be best illustrated in a single census tract in Brooklyn.

Dyker Heights, long dominated by Italian-Americans, had one of the biggest increases in diversity of any census tract, with an inflow of Asian residents.

“Some of the residents here were so concerned about blacks moving in, they didn’t even notice the influx of Asians,” said Nick Venezia, 33, manager of Ben Bay Realty Co. in Brooklyn.