Your history is off. First, the secessionist states did not attempt to overthrow the Union. They fought a defensive battle from Northern aggression well into the war.
"Yup, yup, we was fighting a defensive war against them mean old yankees who wanted to take the rich man's slaves away, Cleetus."
Seriously, you are a dumb ****.
The thing is, you all are the same stupid people today you were 150 years ago.
As the map below proves, most Civil War battles were by invading Union troops attacking Southern states.
The mistake we made was after the war, we didn't have a drumhead trial of every Confederate leader and hang the whole ******* lot of them. And then make sure that every history book denounced them as traitors and every school child saw THIS picture to explain what the war was about.
Again, the Germans at least feel bad about what they did.