I'm asking because I wonder if the American Revolution extended the life of slavery as an institution in the Americas, and for how long, but stick to factual examples if that is too hypothetical a question.
The British abolished slavery in almost all of the Empire in 1833 (the act was passed in Parliament - it took effect in 1834). Slavery was abolished in the few previous exceptions in 1843. So, attitudes in Britain turned against slavery earlier than in the USA.
"The loudest yelps for liberty come from the drivers of negroes" Samuel Johnson's acid comment on the American Revolution.
I am not sure one could claim that the American Revolution prolonged the institution of slavery in the Americas because slavery persisted in Brazil until 1870. Slavery was never popularly supported in the British Isles, and antipathy continued to grow after abolition, so that much as the British Government might have liked to support the Confederacy, it was unable to do so because slavery was so unpopular.