“I agree that all the states share some blame, but the state’s that were threatening to leave the constitutional convention over the slavery issue share more.”
The three states that you have scapegoated were not even necessary to ratify the constitution and establish a viable nation.
The other 10 slave states could have established a viable constitution and a viable nation that excluded slavery. Do you know why the other 10 slave states did not?
I answered that question in my post to you. If you would extend me the same courtesy and now answer my question I have posted to you three times to you; Do you believe chattel slavery that was practiced in America was morally wrong?