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Explanation: The National Endowment of the Arts, the equivalent to the Instituto Nacional de Bellas Artes in Mexico, uses the term "Arts" or "the Arts", so I would guess the major would be in Arts. Just a thought, hope it helps, good luck!
Explanation: The degree itself would be a Bachelor of Arts (4, or sometimes, 5 year university degree) or Master of Arts (1 or 2 further years of study). Liberal Arts would then be declared the person's "major" (specialty). Or, if the degree was not a general degree in Liberal Arts, but was rather a degree in some aspect of liberal arts, a person could be more specific in declaring their major; for example, a person could have a B.A. in literature, or a B.A. in Fine Arts (painting, sculpture, etc.), or a B.A. in music, etc.