There exist such graduate degrees in the united States as Master of Arts (MA) and Master of Science (MS). To obtain them, the students should earn the Bachelor degree in a closely related field. But, in some cases, the learners have an opportunity to receive Master's degree in a discipline completely different from their undergraduate college major.

Generally, both MA and MS degrees are academically and professionally equivalent, but each features a unique curriculum. Thus, MA indicates specialization in the humanities (majors in such fields as literature, theater, comparative studies, history and philosophy), while an MS features a more technical or science-based field (embraces statistics, physics, mathematics, economics, chemistry, biology, political science and urban development).  

Furthermore, these degrees share many of the same requirements (earned in 1-2 years, both generally require you to write a thesis, often prerequisites for a doctoral degree).

Therefore, to decide which of these Master’s degrees to pursue in the United States, the student should  consider his/her previous academic work, as well as professional goals. Moreover, the awarding with MA or MS degree highlights that you have achieved personal and professional achievement.