[cowboyusa]

The Founders were trying to hem slavery in, the beloved that it was on it's way to extension, the Cotton Gin changed things. Also, the Slavery System was anti free market and anti- innovation

[DiogenesLamp]

The Founders were trying to hem slavery in,

No they weren't. God had already hemmed it in for them. Slavery couldn't grow anywhere in the territories because the climate wouldn't allow the creation of plantations.

Slavery was stuck in the South and couldn't get beyond it even if they wanted it to.

Given a few more decades, it likely would have dissipated in the South too.