Who Stopped the Slave Trade - and How

That first step matters more than it may seem. The campaign was the first of its kind: mass petitions, badges, pamphlets, and public speaking by formerly enslaved people. Many tactics used by social movements emerged right then.

The sugar boycott was another innovation. Refusing to buy goods produced with enslaved labor gave people who could not vote a way to take part - especially women, who played a major role in the campaign.

The testimony of survivors themselves played a decisive role. A book by a formerly enslaved man describing the journey across the ocean firsthand sold in huge numbers and turned an abstract issue into a concrete human experience.

Rebellions on the islands were just as important. They made the system costly and dangerous for owners, and this argument came up in parliamentary debates no less often than the moral one: keeping people enslaved was becoming more expensive than letting them go.

The ban created ways around it: ships sailed under foreign flags, and intercepted cargo was sometimes thrown overboard. The routes could not be blocked completely for decades, and the transatlantic trade faded gradually.

Abolishing slavery did not mean equality: almost everywhere, it was followed by forms of forced labor and debt bondage. It is worth remembering this so we do not turn history into a story with a clear ending.

The cost of enforcement also matters. Patrolling was expensive and came with losses among crews, while intercepted ships went to prize courts, where the fate of both the vessel and the people aboard it was decided.

The question of motives remains contested, too. Some historians emphasize the strength of the public campaign; others, the advantage for a country that had already shifted to a different economy. Most likely, both factors worked at the same time.