In Oklahoma, the requirement usually is up to “algebra 2” - this is mostly domain and range, finding roots of polynomials, and logarithms.
IMHO, the world would be better if calculus was a required part of the high school curriculum. Like yeah, most people aren’t going to need the product rule in day to day life, but the fundamental ideas about rates of change seem like they’re something that everyone human deserves to be exposed to.
People understand the idea of instantaneous speed intuitively. The trouble is giving it a rigorous mathematical foundation, and that’s what calculus does. Take away the rigor, and you can teach the basic ideas to anyone with some exposure to algebra. 6th grade, maybe earlier. It’s not particularly remarkable or even that useful for most people.
When you go into a college major that requires calculus, they tend to make you take it all over again no matter if you took it in high school or not.
Probability and statistics are far more important. We run into them constantly in daily life, and most people do not have a firm grounding in them.
I don’t think you can know when it will be useful, but you could need it 25 years after you leave school suddenly. Better to have the best foundation possible. So if there is a way, a method, that can teach the highest math to the youngest group then that’s the one I support, but I don’t know what that is myself I’ll admit
You could use that same argument for any other type of math. Boolean logic. Linear algebra. Hyperbolic geometry. You have to pick something for high school, and you should pick what’s most likely to be useful to anybody.