I'm all for honoring the past, but sorry, treason is treason. Was disappointed to see Jeff Sessions tweeting along these lines today.
If you think slavery was not the cause of the civil war, then you're delusional.
This is coming from someone who has no problem with confederate flags and statues.
Sorry for invading your "room."
It turns out that although they tried, the Confederates were unable to "succeed" from the Union. They failed to SECEDE also, because they LOST THE WAR against the United States.
Treason against the United States is the act of levying war against the same. That's what happened at Fort Sumter, when the Civil War started and when southerners attacked a U.S. military base.
Honestly, I'm sympathetic to the preservation of Confederate history, but you don't seem to know anything about it.