Slaves ended up going to where there was money to be made using slave labor. We don’t remember now, but sugar used to be quite expensive and its cultivation was very labor intensive. Very little sugar could be grown in what is now the US so most slaves didn’t come here. Tobacco, indigo, and rice were cash crops, but no where near as valuable as sugar.
By the time the cotton boom started, importation of slaves into the US was banned. It’s worth noting that Congress voted to ban the international slave trade as soon as it was Constitutionally allowed.
yup a picture says a 1000 words