again, if slavery was “enshrined in the Constitution”, how did more than half of the States of the Union outlaw the institution. If you read the Confederate Constitution, that is how you enshrine slavery in a Constitution. Again, our Constitution does not make slavery illegal, nor does it make it legal. It acknowledges the existence of slavery in the United States, and does make some provisions for it. The Constitution makes no pronouncement on the legality of secession. That, like the slave issue was left for later generations of Americans to decide. Those decisions have been made.
“again, if slavery was “enshrined in the Constitution”, how did more than half of the States of the Union outlaw the institution.”
Consider there is the U.S. constitution; and there are individual state constitutions. That’s how.