I think you’re confusing joint degree (sometimes called dual degree) with double major.
Here’s an explanation of the difference from one university. https://inside.cias.rit.edu/studentservices/student-services-information/doubledual-degrees/
It sounds like you want to double major. So the things you need to look into by looking at each school’s website are:
- If the school has more than one undergraduate college and you have to apply to a specific college, are both majors in the same college? (Most likely, you'll find both in something like the College of Arts and Sciences.)
- Do you just apply to be an undergraduate with the expectation that you'll declare a major at the end of sophomore year or do you apply to a specific major? Both are common arrangements.
- If you have to apply to a specific major, how do you apply to two, presumably within the same college? I'm entirely sure the information is available on each school's website.
As for double majoring in history and math, sure. You can do that. Why not? People double (and occasionally triple) major in all sorts of combinations. Sometimes it’s two unrelated subjects, both of which they find really interesting. Sometimes it’s two related subjects. Sometimes it’s one major intended to be practical and career oriented and another. purely for love of the subject.