Oddly, having grown up in rural Indiana in the 90s, I actually had really solid education through and through. We had honest decent coverage of the Civil War and it was emphasized how awful things were for the slaves. Same with WWII.

Can’t speak for the whole state ofc, but my school at least did a good job.

Ohio was the powerhouse of the north. Ohio Civil war history classes were less focused on the atrocities of the slaver, but that was so there could be more focus on the underground railroad, the indignity to both humanity and Ohio of the fugitive slave act, and many of the ohioan heroes of the war like Grant, Sherman, and Brown. We didn't learn as much about Oberlin as a hotbed of anti slaver resistance than you'd think though.

But yeah, despite the traitors rags that've slowly crept into the state there's a reason why Columbus's hockey team is named a reference to union soldiers.

Also it wasn't deep red until recently. It was a victim of redmap, extreme gerrymandering, and propaganda, but Ohio went to Obama twice and had a blue senator until last year.