But then over the years, I realized that Americans simply didn't think math is that important to everyone, as the meme illustrates: https://www.reddit.com/r/EngineeringStudents/comments/pd6hhc...
So, the high schools by default just teach the very basics: some calculation, some definitions, and etc. Those who want to go deeper have to push themselves. I guess nothing is wrong with this approach, as indeed only a small percentage of people would use maths harder than Common Core day in and day out. On the other hand, I do feel a lot of ordinary kids would miss out - they could be come decent engineers, if someone pushed them or showed them the way when they grew up in high school.