The Full Story
After 1807, Britain didn't just end its own slave trade. It systematically pressured every other slave-trading nation to do the same.
Portugal, Britain's oldest ally, was threatened with naval action and forced to sign treaties restricting the trade. Spain received payments and ultimatums in equal measure. The Netherlands capitulated under diplomatic pressure. France joined 7 other powers in the Vienna declaration of 8 February 1815 condemning the trade, though French enforcement lagged for decades.
Brazil held out longest in the Atlantic. Britain responded with the Aberdeen Act, treating Brazilian slave ships as pirates. When that wasn't enough, the Royal Navy sailed into Brazilian harbours and burned slave ships at anchor.
America resisted differently, refusing to let British ships search American vessels. Slavers flew the Stars and Stripes as a flag of convenience. It took the Civil War to end American obstruction.
One by one, nation by nation, Britain dismantled the Atlantic slave trade. It took sixty years. It cost thousands of lives and millions of pounds sterling. The last known voyages ended around 1867, and the trade that had embarked around 12.5 million Africans was finished.
Why This Matters
Britain's systematic campaign against every slave-trading nation is unique in history. No other country has expended such effort to end a practice it had previously profited from.
Key Facts
- ⚠Correction: the video says France was made to sign anti-slave-trade provisions as a condition of peace after Waterloo, and gives 12 million transported; the accurate form is the 8-power Vienna declaration of 8 February 1815 with slow French enforcement, and the standard estimate is around 12.5 million embarked (SlaveVoyages).