I don’t expect it to factor negatively at all into admissions. As a history major you will get a lot of attention from your professors because you will be one among very few students who will be doing that. But MIT will probably like that you will bring something different to their school. Since they aren’t looking for 1000 clones… Also they know that you can change your major multiple times until you settle for one, so they don’t accept students based on intended majors. I happen to know students that went into MIT intending to major in STEM but changed to humanities in the end.