Noooo
1787 "demarcates" the time when most Northerners began opposing slavery in practice as well as theory.
1832 "demarcates" the time when most Southerners abandoned their pretenses of opposing slavery, even in theory.
jeffersondem: "Regardless, there does seem to be in Puritan minds two epochs: the golden era of slavery when northern and southern gentlemen talked the pious precept..."
The "pius precept" as expressed by Thomas Jefferson that, "all men are created equal."
jeffersondem: "...and later the bad epoch when southerners used labor bound to service to grow food and fiber.
TWO TOTALLY DIFFERENT THINGS!, the man said."
Before 1832 Southern leaders like Thomas Jefferson not only preached equality but practiced it politically, in the form of restrictions on the slave trade and abolition in Northwest Territories.
In 1832 the Richmond Enquirer called slavery,
That is an interesting comment.
Every northern state, including the Keystone state, voted to enshrine slavery into the Constitution of the United States.
But the northern states did not enshrine slavery into the Constitution gratuitously: they had good reason. It was thought to be in their economic and political best self interest.