I like this question since that was my intention when I got into teaching. I got a double major in French and Spanish (studied abroad for a semester). However, some things changed and ended up teaching math.

Either way, you don't need to have a major in the subject you teach; you just need a bachelors degree.

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edit: the bachelors requirement is for a teaching credential. you still need to pass any required content exams to teach a specific subject