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It did:

https://en.wikipedia.org/wiki/Slave_Trade_Act_1807

https://en.wikipedia.org/wiki/Blockade_of_Africa

https://en.wikipedia.org/wiki/Slavery_Abolition_Act_1833

It even pressed other countries to abolish it (not only for pure reasons, also for commercial ones, but they'd still make Machiavelli proud).

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When the Union blockaded the Confederacy, cotton workers in Lancashire, England (who were out of work without raw material) rallied against the Royal Navy breaking the blockade though it would have been in their economic interest at the time. Solidarity forever.

https://www.bbc.com/news/world-21057494

The Royal Navy, which had historical links to slavery, even ended up positioning ships in the Atlantic specifically to stop slave ships:

https://en.wikipedia.org/wiki/West_Africa_Squadron

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