If you take the number of families in the eleven Confederate states the total number in 1860 was 1,027967 and for slave owners it was 316632. If we assume that all slave owners had families, the total number of families by percentage that owned slaves was about 30%. This is what is used.
How many slave owners were bachelors?
How many slave owners were aliens and lived outside of said state?
How many slave owners were corporations, coops or government agencies?
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David Upton