I am currently a junior in high school and I want to be a history major should I take Algebra 2 my senior year
What have you taken so far?
You need to check your HS graduation requirements and the College requirements. Most colleges require at the minimum, Algebra 1/2, Geometry/Trig regardless of your major. I suggest you look up the Freshman admission requirements for each school you are interested in applying and make your schedule accordingly.