How was William Wilberforce, a member of Parliament, able to affect the future of slavery in Britain?

William Wilberforce campaigned for years in Parliament against the British slave trade. In 1807, Parliament passed legislation abolishing the trade in enslaved people by British ships and subjects. This was different from ending slavery itself throughout the British Empire, which was abolished later, in 1833. Therefore, the correct choice is the 1807 ban on the British slave trade.

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