I know you mentioned North America, but my family has some slavic roots via South America.
Brazil has millions of Polish and Ukrainian descendants. If I'm not mistaken, the largest Ukrainian diaspora in the world is in Brazil. They are sprinkled throughout the country, but have a very dominant presence in places like Curitiba and the rest of Paraná state. There are also lots of Russian descendants, including Russian mennonites in the Savannahs of Mato Grosso state (Primavera do Leste).
Personally, I have Ukrainian ancestry mixed in with a bunch of others via Rio de Janeiro. Rio has a good population of Ukrainians who fled during the War, a big percentage of who are Jewish. This is restricted to Rio mainly, as the rest of them are Catholic or Orthodox.
The slavs in metropolitan settings have fully integrated in Brazilian society, but those in rural settings/towns are still very traditional and most people are bilingual Ukrainian/Portuguese. Below is the city entrance to a town mainly of Ukrainian ancestry in Paraná.