The immediate benefit to becoming fluent or near fluent in a second language (speaking that language with others who can speak it) is great. The adjacent benefits are amazing. I believe the process of learning a language allows for deeper cultural understanding, changes paradigms and even creates pathways in the brain for new, better, and more efficient ways of thinking. These benefits aren't guaranteed, clearly, but the second language definitely opens doors that weren't there before.
Agreed. One of the educational changes I’d like to see is kids taught a second culture from kindergarten through 12th.
Some obvious choices are Spanish, Chinese, French and Arabic. Parents simply choose what they want their kid in and bam. A nation of adults that are all at least bilingual within one generation.
Not to mention all the side effects I think would happen. Like combating racism and religious bigotry.