America is infamous for, having Sundays being the most Segregated day of the week, especially the hours when people go to church. It tends to confound foreigners who are Protestant. Of course, Catholics in the United States have either lots of Latinos in their churches or in a reflection to the 19th and 20th centuries Ethnic enclaves ; I would gather Latino, Vietnamese, Filipino etc;.

The big divide of course, was/is the Black American Catholic issue. I have seen the lures of " Gospel Masses, Afro Centric" and such being used as a lure, but not just the Novus Ordo,  or an approved Mass in Latin and heaven FORBID if you're Black and venture into the Traditional Catholic realm; you will NOT be welcomed. I learned that lesson in 1992 myself!
 
You have to be a very brave person to go where you may not be wanted; for me it as deciding that leaving "Traditional Catholicism" was better than getting arrested in a suburban "house church". Food for thought.