Except that is not true as you stated it.
Our nation as Americans was already going down the path of abolition even before we declared Independence, but the crown kept vetoing our laws which essentially forced us to have an institution we did not desire to have kept around.
What I stated is true. And you just showed it to be true. Yes we were on the path towards abolition, but when it came time for the wood to meet the road we chickened out. The Crown’s opinion stopped mattering when we declared independence, and mattered even less when we won. That’s a perfect time to dump “institutions” from the old country, like say the crown... and slavery. And we chickened out. There was a choice to be made, did they believe their bold statement of all men being created equal, or not. They chose not.