Spanish is considered as second language in U.S. It is the part of the Latin Language Family, easy to start the other similar language learning.
Mandarin is the language talked the most population in the world. As the world's communication, it is now very popular and useful language to learn in many ways.
English is the most popular language in the world, It is used in most of the world's official meetings. It is taught in most of the countries as 2nd language.