Spanish. We need it in America. (That is a funny sentence, but it is actually very true.)
I took French in high school because I thought it was a prettier language. It was fun, but not very useful. (Although I did use my French just once while I was in Amsterdam on my way to Germany 17 years ago. I attempted to order from a menu and was able to determine a few things I did not want. But other than that, well, not so much.) Spanish, however, is quite a useful language both in America and abroad.

