There are Constitutional amendments that benefited slavery.
The Constitution protects property rights. Slaves were property according to the laws of many states. Slavery was not a nation-wide Constitutional provision.
Your phrase “pro-slavery provisions” is not accurate.
I agree, Jesus would not have favored the killing in the civil war, or the oppression of slaves.
Yes, my family took up arms after Fort Sumter was attacked. They fought to force changes to the Constitution, not to overthrow it.
My family was on the winning side that forced the end of slavery, by force of arms when it wasn’t being ended by political means.
Then, assuming they served honorably, they were nothing more than citizens doing their civic duties, as required by law, just as millions of others, North, Border and South, also did.
We do not blame soldiers for the misjudgments or malfeasance of their leaders.
The soldier's duty is only to serve honorably and lawfully.
God will ultimately decide who wins, who loses, who lives longer & who dies sooner.
That's in His hands, not ours.