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In page Early life and career of Thomas Jefferson:

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Within a few generations, the Jeffersons rose from that of middling planters who struggled against low tobaccos prices beginning in the 1680s to that of the country elite and to the very pinnacle of society.[citation needed] The plantation-based economy of the Jeffersons and their peers relied on acquisition of slaves from West Africa and West Central Africa, primarily from the Bight of Biafra and Angola. In 1784, Jefferson published Notes on the State of Virginia where he stated that enslaved individuals made up to a third to a half of the inhabitants of most Piedmont counties of Virginia.[4]