The first thing that I would do is ditch the Socialist term “Social Studies.” US History deserves a class of its’ own.
Get some solid American History books for use at home. Better, teach the kids at home. Public School is worse than a waste of time. You have to spend as much time and effort countering what the kids do learn in class as they spend in class if you wish them to be educated. Anything significant and academic as our grandparents thought of academics the kids will have to learn outside of public school. My wife has been a public school teacher for 5 years. We home and Christian schooled our kids. A higher percentage of Public School teachers homeschool or private school their kids than members of any other profession.