[Kansas58]

The founders DID break British law.

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.

The founders who had anti slavery feelings worked within the frame work of the new government to make slavery less and less profitable and less powerful.

In fact, the idea that a Black man was only counted as 3/5 “human” for census purposes helped keep the number of Southern proslavery members of Congress at a minimum.

Counter intuitive, perhaps, but that is the truth.

[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.

[Borges]

Wasn’t the Slave Trade made illegal in the U.S. in 1807?