[mike182d]

However, at our founding, as Mark Levin makes clear in his book, the founders made the slave trade illegal and formed a system of government that, eventually, outlawed the practice.

That's also because they realized they needed the full support of the all the colonies in order for the Revolution to succeed. Banning slavery outright would have stifled that effort. The Revolution was more important, and then the rest could be worked out later.

[Kansas58]

Exactly!

The defeat of the Brittish was the first item on the agenda.