Why did landowners in the chesapeake colonies begin using chattel slavery?

Landowners in the Chesapeake colonies begin using chattel slavery as they needed workers to work on their plantations. This is due to increased demand for tobacco and the ease with which it grew which had made tobacco into the largest cash crop for the Chesapeake resulting in the need for labor

They needed workers to work on their plantations.(APEX)

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b. second continental congress