How come employer say you must speak spanish to work here?

There are some areas in the world where Spanish is a highly spoken language, even though it is not the primary language of the area (like many parts of the United States). Employers who have companies in these sort of areas may require that a worker be fluent in both the native language of the country and in Spanish as well. If the company has a high amount of Spanish-speaking clients, then it is important that workers be able to communicate with them or they risk losing clients.