The repubs didn’t import negros from Africa.
No the Brits did. Importing slaves ended soon after the constitution was made law. ( Slave Trade Act of 1794)
Had ending slavery been included in the constitution then southern agrarian states would have formed a separate country. And yes they were what you would call democrats. But the names and parties were different then.
I vote republican. I hate most republicans. I LOATHE democrats