The USA has never had an official language. In practice, the government uses English.
Knowing the history of other countries that have tried to impose a majority language on INDIGENOUS populations (Not immigrant populations but populations that predate the formation of the USA) trigger separatist movements and massive resentment.
Some examples: Kurdish in Turkey, Catalan in Spain, Welsh in the UK, Arabic in Israel, Tamazight in Algeria, Tamil in Sri Lanka, Breton in France, Swedish in Finland.
New Mexico (surprise, surprise, surprise) used to be a part of Mexico like the majority of the Southwestern states. The people who were living there when the USA took over have descendents who still speak Spanish. There's also French speakers in Maine and Louisiana in the same situation. Hawai'ian WAS banned in Hawai'i and there's still a lot of resentment.
Many of the people you mention don't really give a rats ass about the language part, as they do about other things.
Hawai'ins aren't pissed so much about language, but the fact that they were taken over by a coup.
The Kurds had their own country until the UK and France chopped it up and gave it away, despite being our allies. The "host" countries have treated them like shit ever since.
People from Wales are 2 halves. The majority of them speak English natively and the small "half" speak Welsh. The funny thing is, Welsh has to use a lot of English words because the the language doesn't have them. The UK subsidizes "native" languages (back in 2010) to the tune of £27 billion a year each. I'm gonna assume this figure has risen like everything else.
The US bought the southwest states to cover Mexico's debts.