Yes, Jefferson pointed out that slavery came from the Empire and that the King was vetoing abolitionist laws which were attempted to be passed in various colonial Houses of Burgesses and Colonial Congresses, etc.
America would be very different today had abolitionism been allowed to take place prior to Independence Day.
Even though those laws were vetoed, it is still a powerful push back against Critical Race Theory.
The US would have remained part of England. Your sentiment is also baloney because at the time the constitution was written, almost all the states were still slave states. They had had 11 years to pass abolition laws, yet they were all still slave states. Massachusetts was only a "free" state because of judicial activism and a ridiculous interpretation of the state's new constitution by a liberal activist court.