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

I think it is difficult to decided what American should study as a second language because their language is international and global. English in the past and until now is very common, and there are many schools and universities teaching English around the world. However, if all American had to study one foreign language, I will choose Arabic not because it is my language but for several reasons. First of all, when American learn Arabic, they can understand about Islam and do not believe anyone distorts it, and they will understand what is the truth. Also, there are many countries around the world speak Arabic in Africa and gulf states. If American learn Arabic, they will have perfect communication with Arabic speakers and have business together and more opportunity to work. I realize in my country there are many American work in different companies like Saudi Aramco, so they need to deal with people and speak with them. Finally, I recommended American to study Arabic language as a second language.