damn, bro. It's almost like America is bigger than all of Europe and shares one language, and it's hard to become fluent in a language when there's no one to speak it with. If you are asian or european you can hop in the car or on a train to practice your french or vietnamese, but unless you're practicing Spanish or some specific language kept in your area(Polish in Chicago, Pennsylvania Dutch, German in some parts of Wisconsin) you have no way to practice.
where i grew up in burger land, back in the 80s, the public schools were teaching us all spanish in from age 5 to 10. not like true bilingual education, but we had a spanish class once a week. it last about 2 years before the white nationalists--who panic at the idea of working class people easily communicating with each other--got it shut down. between that and some years working with seasonal agricultural workers practicing their english, i am at the comprehension level of an inebriated toddler. i wish i had more opportunities to practice. honestly, the US should have all its signs in english and spanish anyway, but you know the reactionaries would go info a full blown pogrom over even a whiff of that being proposed.
i remember some small business tyrant in florida in the 2000s called up my work one time and wanted me to pass along his complaint to my boss that our phone system had an option to "press ocho for espanol". he said that our company even offering the option to "those people" was wrong... in FLORIDA... the state with the name that means "land of flowers" in spanish.
Are foreign languages classes in general not mandatory in US schools ?
Here in 
every kid will have classes for at least two languages (one for four years, one for two IIRC), sometimes three. Depending on where they go to school the kids will sometimes have a lot of choices (Chinese, Polish, regional languages, etc.) or sometimes only either English, Italian, German, or Spanish.
Go easy on us, our 1% needs to keep us stupid for myriad reasons, mostly to stay in power. Don't worry though, they'll come for you next, wherever you are. Likely selling you on some other enemy or distraction.
Fun fact: Some places in Europe "bilingual" is used as an euphemism for students with middle eastern backgrounds. When used like this it carries lots of negative connotations and authorities try to limit the concentration of "bilingual" students at schools as they're seen as the source of all kinds of trouble.
Does anyone have that meme about how you drive four hours through Europe and discover twelve kinds of racism you didn't even suspect existed?
U aint tellin me nutin!