Students around the world study English. If all Americans had to study one foreign language, which one should it be?

 I want to recommend Korean. Well, compared to other languages, it is not easy to learn. For example, grammar of Korean is very different from Korean. Location of component of English is subject, verb, object and so on. Also, there is honorific in Korean. Up to Position of other person, using language is different. However, If you learn Korean, you will get benefits. First, if you are good at Korean, you can learn Japanese just in three months. Grammar of Korean is similar to Japanese. So you do not feel difference between Japanese and Korean. Second, compared to Chinese, you do not memories much letters. Korean latters called Hangul consist of 14 consonants and 10 vowels. With 24 letters, you can write everything. Additionally, Hangul did not naturally occur. Korean latters were made about 600 years ago by a king. 600 years ago, before Koreans use Korean latters, Koreans used chicness latters, but chicness latters were hard to the people, so the king called Sejong made Hangul for the people. Anyway, just I want to recommend Korean if you want to know about the Korea.