The Georgia Experiment was the colonial-era policy prohibiting the ownership of slaves in the Georgia Colony. At the urging of Georgia's proprietor, General James Oglethorpe, and his fellow colonial trustees, the British Parliament formally codified prohibition in 1735, two years after the colony's founding. The ban remained in effect until 1751, when the diminution of the Spanish threat and economic pressure from Georgia's emergent planter class forced Parliament to reverse itself.