There's always more than can be said, but I answered a previous question related to differences between Northern and Southern states with regards to history education that speaks to some of what you're asking. I use Texas and New York State as examples.

From the post: Northern states - through a combination of tradition, guardrails around course expectations, and cultural norms - expect(ed) districts to provide students with a comprehensive history education that focuses on America's shared history, which includes the Civil War.

Southern states - through a combination of tradition, textbook adoption, and cultural norms expect(ed) teachers to provide students a history education that focuses on a comprehensive understanding of what it means to be a Southerner, an identity framed around the Civil War.