The adjacent cities of Clifton and Passaic, NJ were once the home to a variety of eastern and southern European families, many of which emigrated from Europe between 1900 and 1920 so as to find work in the many mills and factories in the area. Today, most of the factories are closed, and most of the Euro families have moved on to more distant suburbs. But northern NJ still has a diverse economy with a continuing need for cheap labor, and over the past 30 or 40 years, this has attracted a wide variety of Latin nationals to settle in the older neighborhoods in Clifton and Passaic where the Polish, Italian, Hungarian, etc. groups used to live. The Puerto Ricans came first, but today the predominant group seems to be the Mexicans. (Also, there is increasing Middle Eastern settlement in the northern areas of Clifton and adjacent South Paterson, e.g. Lebanese and Syrians).
The Poles were probably the most predominant ethnic group in these cities up through World War 2, and today a handful of Polish and later-generation Polish-ancestry families remain. And thus, you can see “ethnic stew” scenes like this: the El Mexicano restaurant sited right next to the Homemade Pirogi store on Main Avenue (they claim to have 17 varieties), just up a few blocks from the Passaic border. For the most part, everyone seems to get along. I would bet that the Mexicano gets a few tables of Polish-heritage customers, and the Pirogi place occasionally sells its wares to hungry Latin families looking for a different kind of inexpensive but filling cuisine. So, the ethnic stew of immigrants keeps on simmering in Passaic and Clifton, just as it has for over a century now!