The multicultural aspects of American history are vastly underappreciated. We learned ad nauseum of the "melting pot" concept, but it used to be more the norm that any "melting" wasn't really necessary, as much as a "blending" where maintaining a prior culture at least to some extent, including language, was acceptable or even encouraged.And yes, Spanish is a native language just as English is.
Case in point, my grandmother was born in 1901 in Shelbyville IN. Her birth certificate, an offical government document, was written in German. That was acceptable. English was not an "official language". Then in 1919 she got married. Her marriage certificate, an offical government document, was also written in German. That was acceptable.
German-English bilingualism in Indiana of course fell out of favor in WWII. But the idea that such situations were ever the norm also has been seemingly whitewashed from common knowledge.