Indeed - there is an interesting question on Stack Exchange about if a law written and passed in Spanish would be valid (https://law.stackexchange.com/questions

Indeed - there is an interesting question on Stack Exchange about if a law written and passed in Spanish would be valid (https://law.stackexchange.com/questions/80132/if-congress-passed-a-bill-written-in-a-language-other-than-english-would-it-be https://law.stackexchange.com/questions/80132/if-congress-pa...) - the conclusion (based on my own summation of the discussion) is that it probably would, but it would cause some problems due to a lack of precedent / legal definitions. There hasn't been a federal law passed in anything other than English, but there have been early state laws (in Louisiana) passed in French (https://law.stackexchange.com/questions/80132/if-congress-passed-a-bill-written-in-a-language-other-than-english-would-it-be https://law.stackexchange.com/questions/80132/if-congress-pa...)