Perhaps we should call it the "war that you don't know anything about but slavery is a good buzzword for the topic and so we'll ignore all of the other reasons (which make up the bulk of them) why states wanted to secede." That's probably too much for you to understand. You're right, we'll just go with the slavery thing. I'll give you the fact that slavery was one of the straws that broke the proverbial camel's back but it wasn't the bulk of the issue. Then again, it's hard to get that information from the text books we were raised with, here in California*, because of the "apolitical nature" of our curriculum. Oh wait... that's actually a complete load of crap. I'm pretty sure I was taught to have "white guilt" in school.
Look how I brought that back to the actual topic at hand... nifty. I definitely don't support Texas being the dictator of education but California has very little room to whine about another state's political leaning being introduced into their curriculum. Regardless of what a text book said, California teachers push the idea that the founding of America was an evil venture. We screwed everyone, at every step, and should feel horrible about this. Make sure to disregard that this was _how business got done_ at the time. I don't want god in my books but California needs to stop forcing their own political agenda, via public schools, before calling out someone else.
* I'm not native but I was 3 when we moved here. Every school I went to was public and all in the Silicon Valley. I mention this so people don't try and debate my understanding of the school systems here.