With any pre-1900 POD you like, create a situation where the United States of America (NOT some ATL analog thereof where North America is never colonized or some-such) has a Native American language which is either
A) A second official language in a bilingual state within the U.S.A. – it doesn’t have to be but if the tongue is the majority language (like French is in Canadian Quebec for example), then your scenario meet the spirit of the challenge.
B) The second official language of the entire United States.
C) Is the primary language of U.S.A.!