Wilberforce's Slave Trade Act passed the Commons in what year?

A Victory Decades in the Making

On 23 February 1807, the House of Commons voted 283 to 16 in favour of the Slave Trade Act — a landslide that ended more than twenty years of grinding parliamentary struggle. The moment moved many MPs to tears and a standing ovation for William Wilberforce, who sat in the chamber that night barely able to believe what he had witnessed.

Who Was Wilberforce and Why Did It Take So Long?

William Wilberforce was a Yorkshire MP and evangelical Christian who first introduced a bill to abolish the slave trade in 1789. He did not succeed. He tried again in 1791, 1792, 1793, 1797, 1798, 1799, 1804, and 1805. Each time, powerful commercial interests — merchants in Bristol and Liverpool who grew fabulously wealthy from the trade — lobbied hard against him, and each time the bill either failed outright or was quietly strangled in the House of Lords.

The slave trade was enormous business. British ships were transporting roughly 40,000 enslaved Africans every single year across the Atlantic. Plantation owners in the Caribbean had friends in Parliament, and the argument that abolition would devastate the British economy was taken seriously by many legislators who might otherwise have had moral qualms.

What Changed by 1807?

Several forces converged. The abolition movement had spent years building public opinion through pamphlets, boycotts of slave-grown sugar, and the circulation of Josiah Wedgwood's iconic "Am I Not a Man and a Brother?" medallion. Hundreds of thousands of ordinary British people signed petitions — one of the largest mass petition campaigns the country had ever seen.

Strategically, abolitionists also reframed the argument after the Haitian Revolution (1791–1804). They pointed out that importing more enslaved people into Caribbean colonies was actually dangerous to British interests — revolts were becoming harder to suppress. Suddenly, abolition could be sold as prudent policy, not just moral principle.

A shift in government also helped. The Grenville ministry, which came to power in 1806, was broadly sympathetic. Lord Grenville himself steered the bill through the Lords while Wilberforce and his allies handled the Commons.

What the Act Actually Did — and Didn't Do

The Slave Trade Act made it illegal for British subjects to participate in the transatlantic slave trade. Ships caught carrying enslaved people faced heavy fines. It was a genuine, enforceable prohibition, and the Royal Navy was eventually deployed to back it up along the West African coast.

But it is crucial to understand what the 1807 act did not do: it did not free anyone already enslaved. The roughly 800,000 people held in bondage across British colonies remained enslaved. Full emancipation would not come until the Slavery Abolition Act of 1833, and even that came with a notorious compensation scheme — paid to the slaveholders, not the enslaved.

1807 was a landmark, but the campaign was far from over the night those MPs stood and cheered.