Most of the free African-American families in Delaware before the Revolution had migrated from Maryland to find more affordable land. They were descendants chiefly of relationships or marriages between white servant women and enslaved, servant or free African or African-American men. Under slavery law, children took the social status of their mothers, so children born to white women were free, regardless of their paternity, just as children born to enslaved women were born into slavery. As the flow of indentured laborers to the colony decreased with improving economic conditions in England, more slaves were imported for labor and the caste lines hardened.