University of Georgia
Purdue University-Main Campus
University of Minnesota-Twin Cities
Pennsylvania State University-Main Campus
Ohio State University-Main Campus
University of Florida
University of Illinois at Urbana-Champaign
For classes, I'd recommend continuing to take History classes for all 4 years in high school. I also recommend taking some Humanities classes as electives, such as Literature, Philosophy and Religion, Political Science, Sociology, Economics, and a foreign language course.
When you're in college, I'd recommend similar courses but with a more laser-focus. Your first two years will most likely be General Ed classes with some courses for your major and minor peppered in. You only really get deep into your major starting in your Junior (3rd year) of schooling. Choose a time period of history you enjoy. You can also select perspectives/lenses of History. See what History was like through the eyes of Women, Indigenous folks, Black Americans, etc.
Don't forget the extracurriculars! You can volunteer to work at your school library (both in high school and college.) Some local history museums also offer docent programs, where you volunteer as a tour guide in the museum. Look for local historical societies and join them to start networking and meeting with real-life historians.