Examine the statistics on slavery in the US at the bottom of the document Causes of The Civil War What percentage of the total population were slaves in the lower South?

Slaves made up about 4% of the entire population of the United States. Right around 3/5 of the slaves were white, whom were called "endentured servants". The remaining 2/5 were Africans, whom were soled to the Europeans from Africa by there own fellow Africans. In all, about 1.6% of the entire population were black slaves.