At the end of the 18th century, public opinion began to turn against the slave trade.
The first group to publicly announce its opposition to slavery was the Society of Friends (a Christian group also known as the Quakers). In 1761 they decided none of their members could be involved in the slave trade.
In 1787, the Committee for the Abolition of the Slave Trade was set up. William Wilberforce MP represented the Committee in Parliament. Nine of the original twelve members were Quakers.
At first they’d argued among themselves over how to tackle slavery, but in the end they decided that trying to end slavery immediately was too big a task. Why?
The Society decided that the best approach was to try to end the slave trade, rather than slavery itself. This would at least end the misery of the Middle Passage. It would also make current slaves a valuable commodity, forcing their masters to treat them better.