Government agencies, corporations, public service administrations, internal organizations, the courts, universities, hospitals need people to translate documents, simultaneously or sequentially interpret into English from a foreign language or from English into a foreign language and interact with employees and customers who do not speak English. In fact, many large corporations, like Visa, are looking for customer service professionals who can speak more than one language. Multinational corporations, like Sony, advertising agencies, book publishers, computer manufacturers, software companies, banks, retailers, manufacturers of almost any product, etc., need professionals with strong business and language skills who can communicate successfully with customers, understand diverse cultures and create products for markets around the world. Professors in many disciplines and librarians need to be literate in several languages. It's the only way they can really do extensive research.
Entertainment is one of America's largest exports.
Film recording, etc. Newspapers, magazines and TV are global. Journalists need foreign languages. Musicians need to be able to translate lyrics into other languages. Museums need multicultural curators and assistants to work with foreign texts and negotiate acquisitions from all over the world.