Texas, the new Florida

1. It wasn't. It was much more than just Nazi, Hitler, death of many "Orthodox" Jews and WW2.
2. The Civil War was about the reunification of the Union. Slavery was a key driver to secession but the Civil War started 2 months after Texas seceded; what happened during that time? If Lincoln could have kept the Union together while keeping the institution of Slavery, he would have. Those were his words.
3. The "failings" of the Civil Rights Era/Movement should be an "in house" discussion, as there were failings and true Civil Rights leaders began to see it. Martin Luther King's burning house comment alludes to this.

So, if I am wrong, you should be able to tell me how I'm wrong

The holocaust was mass genocide of a number of groups. There is not a single rational excuse for it and parsing words like black and white doesn't cut it. Hitler and his group extinguished the life of millions of jews, gypsies and others. Perhaps you can explain how it's anything other than black and white and pure evil incarnate.

Perhaps not.

The civil war was 100% over slavery. The fact Lincoln said he'd save the union and keep slavery only illustrates his priority was to save our nation more than emancipate the slaves. That said, as the direct descendant of slave owners, slave traders and plantation owners, I am here to tell you that were there no slavery there would have been no war. There is no amount of state's rights nonsense nor economic oppression or "Murika Freedom" argument you can make that will change the facts.

History has to be taught warts and all. It's not to increase self image, it's to increase self awareness. Moral failings of figures or any time or movement are necessary to understand fully the person so that nuance and detail can be better understood. Not teaching about Jim Crow because MLK Jr was a philanderer or whatever crappy rationale you're pitching should not ever preclude the instruction in our history.