NY. Amateur photographer Luis Fernandez has shared a few stills taken in Washington Heights, the most Dominican of any area in the entire U.S.
Fernandez, who arrived in “The Heights” in the early 1960s, is part of a major wave of immigrants rooted in the towns of the north slope of Dominican Repubilc's Central Mountains, known as “La Sierra.”


You are mistaken:
"In the early 1900s, Irish immigrants moved to Washington Heights. European Jews went to Washington Heights to escape Nazism during the 1930s and the 1940s. During the 1950s and 1960s, many Greeks moved to Washington Heights; the community was referred to as the "Astoria of Manhattan." By the 1980/90s, the neighborhood became mostly Dominican."