Not only that, most Mexicans are bi-lingual. So are many of the other “unknowns” who came from places besides Mexico.
I’ve noticed an increasing number who are not bi-lingual. I own a restaurant in Nashville and we’ve been getting more in lately who have new cell phones and use a translation app to order. I suspect they are being issued the phones at the border, taught how to use the app, and released to the interior.
English is the main foreign language taught in schools, and Mexicans with the equivalent of high school tend to speak it. But there are a lot of illiterates.