Why did the abolition movement began in Britain?

The abolition movement in Britain began in the late 18th century primarily due to growing moral and humanitarian concerns about the inhumanity of the transatlantic slave trade. Influential groups like the Society for Effecting the Abolition of the Slave Trade, formed in 1787, mobilized public opinion through petitions, pamphlets, and public meetings. Additionally, the Enlightenment's emphasis on individual rights and freedom played a crucial role in challenging the justifications for slavery. These efforts culminated in the passing of the Abolition of the Slave Trade Act in 1807.