I honestly think it’s because in measures of distance, a US American could be considered well-traveled without ever having left the United States. Living in DC and visiting Florida or California is a big trip logistically. I love to travel and have moved a LOT and I have just barely been to every state in the US (some I only drove through, fuck rural Nebraska). While I disagree personally, I think that most Americans just don’t see the immediate utility in learning other languages.

Not learning Spanish in school as a requirement at this point is just racism, though.