There should be a national language. A singular means of communication amongst people under a single government is logically necessary.
On the other hand, Americans are the most language-challenged people in the world, as a rule. We certainly should teach a children (and adults) more languages than we do. Our foreign language requirements in school are a joke, and that statement is coming from a guy who took 4 semesters of Spanish in college after taking 2 years in high school.
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