EDIT: I have since learned that public schools in the US are not required to teach in English, so you can cross the US off that list! My bad!

Don’t apologise too soon, it’s the basis for their lingual homogeneity, and is a common theme since its inception. For example:

https://daily.jstor.org/when-american-schools-banned-german-classes/

https://hawaiianflair.com/blogs/news/the-history-of-hawaiian-language-suppression-and-revival

And check the history section of the

https://en.wikipedia.org/wiki/Native_American_Languages_Act

Did you know German was the second most spoken language in the USA until ww1? Victims of opression often opress others.