I think this is a matter of the microeconomics concept of “scarce resources”? It’d be lovely if everyone in the US learns at least Spanish. But school can only teach a limited number of subjects, so in the US where most people don’t need to use anything other than American English, it might be argued that it is more beneficial to spend more time on, say, STEM and history, rather than getting kids to learn Spanish/German/Chinese… I guess there are foreign language electives for that reason? They are still highly valuable after all
Besides, learning and teaching a foreign language is hard lol. China used to (I’ve heard rumors that some places changed, not 100% sure) require mandatory English education from 1st grade elementary… social issues with the English teacher expats aside, the English literacy rate in China still looks like that. There are even multilingual countries in Europe where a good number of people struggle to learn/speak the other national languages so… Even if the US wants to do it, it’s not that straightforward
Not very well traveled yet but at the moment… either Prague/Praha in Czechia or Ljubljana in Slovenia probably
Both are pleasant places with beautiful architecture, all kinds of natural scenery as someone who has only lived in flat cities (mountains AND rivers in my city??). Bonus point that Prague has dirt-cheap beer that even comes in alcohol-free variety, Ljulbljana has a ridiculous amount of hiking trails and is within day-trip distance to some of the most beautiful scenery in Europe