Well, its true that Spanish was here before English, and that the oldest permanent European settlements on the continent, including in what is now the US, are Spanish.
However, this particular section of the area, now known as the US, was established by English speakers, and English then became the language of trade and learning. An official language was never established, although at the time of the Constitution, the Germans in Pennsylvania attempted to have German made the official language of the US.
I think the Spanish heritage of the South needs more attention, since Andrew Jackson and others attempted to wipe out the Spanish, Indian and Catholic influence on the Spanish Borderlands, particularly in Florida. In fact attacks on Florida were constant, and the early 18th century British attacks (by British colonists from South Carolina and Georgia) on the Franciscan mission chain in Florida resulted in the British sending thousands of Indians off to slavery on the British Caribbean sugar plantations and the deaths of many, many Mission Indians and Spanish clergy, all non-combatants. The British were very aggressive and vicious in their unnecessary war against the Spanish.
That said, I grew up in NYC where there were millions of immigrants who spoke to each other in their native languages in places where they were very concentrated. What helped the second generation speak English as their main language was the policy of the schools, which at that time was simply to teach immigrant children in English and teach them to speak English. This meant they could easily integrate into the mainstream, since speaking any other language, even one spoken by a large number of people (such as Spanish or Chinese) does not permit you to move out of the ghetto.
The problem is that the Dems went to this bilingual education model - which is essentially monolingual, and that language is the immigrants original native language with a few words of broken English. This guaranteed that the Dems would try to keep it going because it gave Dem politicians a captive, dependent group of people who could never get out of Dem clutches and into the mainstream - because they didnt speak English, the mainstream language.
So dont blame foreign language speakers, blame the educational policies that have made these people unable to speak English.
And Norwegian was here before Spanish.
Dewey Decimate us System?
Sure, but as my old history teacher used to say, time and biology were on the colonists (whether French, Dutch, English or other) side.
In a way the Spanish Empire was a victim of its own success, so far-flung it was impossible to administer and maintain.