I asked my wife about what happens with learning a new language. She’s native Czech and lived in Germany for many many years. It took her a while to learn German - immersion by necessity. She and her family also studied English.
She came back with me in 1976 and began the long road (then) to citizenship. First thing, ESL - lots of it. 39 years later, she speaks English better than many Americans born here.
The real point is that there is a certain point with a new language you begin to think it - not bothering to form the thought in the first language and then translating, but starting with it. She’s that way now. It takes her a while to go back to Czech, and even German, and she still struggles for the right words.
This is Jeb Bush. He’s thinking in Spanish because he is immersed in it with his home life. And to think some want this man to be our President.
That is an excellent point; sadly, it is one which the federal government fails to grasp. A united nation speaks a single language, and thinks in a single language. This extends to the various dialects of English, as well; for example, someone insisting upon speaking in Ebonics is not going to share the same values as someone who at least tries to speak and write in proper English. Multiculturalism always has and always will fail, no matter where its implementation is.