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<p>You don’t have to specifically indicate your major. Since your major’s all under social science division, just say you are a social science major and tell them why you happen to be interested in studying social science. I mean, it would be very weird that a person put Sociology for one school and then Chemistry for the other. Even though your major might be different they will all be related to each other to some degree, so the best approach would be to find similarities and relationships between each majors and very broadly write about why you want to study that field.</p>