This is entirely not supported by the evidence. In
Somerset v Stewart 1772, the King's Bench
ruled that a person who set foot on British soil could not be forcibly removed from the country on the basis of ownership by another person. The judge went so far as to describe slavery as odious. This built upon the 1763 ruling in
Shanley v Harvey.
The general of the US Army during the American Revolution, the first President, was a slave owner – in the first 36 years of the Republic, the presidency was held by slave owners for all but four years.
It can reasonably be argued that protection of slavery was one motivating factor in the prosecution of the American Revolution, that "
we will address it later was not in consideration.
The founding fathers are subjects of repeated hagiography, but the reality is that they were just a clique of upper class dudes with a hair up their collective ass.