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In page Manumission:

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African slaves were freed in the North American colonies as early as the 17th century. Some, such as Anthony Johnson, went on to become landowners and slaveholders themselves. Slaves could sometimes arrange manumission by agreeing to "purchase themselves" by paying the master an agreed amount. Some masters demanded market rates; others set a lower amount in consideration of service.[citation needed] Reytory Angola, herself a freed slave, was the first Black person to individually petition a legislature when she requested the manumission of her enslaved adopted son in New Amsterdam in 1661.[1][2]