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In page Society for Effecting the Abolition of the Slave Trade:

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The first anti-slavery statement was written by Dutch and German Quakers, who met at Germantown, Pennsylvania in 1688. English Quakers began to express their official disapproval of the slave trade in 1727 and promote reforms. From the 1750s, a number of Quakers in Britain's American colonies also began to oppose slavery and called on English Quakers to take action with parliament. They encouraged their fellow citizens, including Quaker slave owners, to improve conditions for slaves, educate their slaves in Christianity, reading and writing, and gradually emancipate (free) them.[citation needed]