Independence(The war, specifically) destroyed slave trading in British Rhode Island, Newport.
The timeline is everything.
https://www.google.com/books/edition/The_Encyclop%C3%A6dia_Britannica/uEkEAAAAYAAJ?hl=en&pg=PA535
Left column, just a little below middle of the page.
You are being extremely disingenuous. Yes, the British occupation of Newport destroyed the slave trade there during the Revolutionary War. (Isn’t your premise that British are to blame for American slavery?)
Slavery persisted in Rhode Island until 1840 and perhaps later. So even though the British destroyed Newport’s slave trade, Rhode Island still had legal slavery for another 60+ years. Who is responsible for that? The British?