Log was absolutely a part of my American high school math curriculum, and while it may not make its way to everyone, many if not most Americans were exposed to it in school. But people have terrible memories when it comes to what they leaned in school, doubly so regarding math, quadruply so regarding higher-level math. Regardless of their level of educational exposure to math concepts, I certainly don't expect the average American adult to be able to reliably do any math they learned outside of elementary school, myself included, because after a few decades of not practicing, not even thinking about those concepts, that knowledge is almost certainly gone or at least covered in a very heavy mat of mental cobwebs.