Some sources believe the actual figures are 10 times as large. Richard Re, A Persisting Evil: The Global Problem of Slavery, Harvard International Review, 2002 There are more slaves than ever ...
Haspel, M. 2024. Human Dignity and Human Rights: From David Walker to Martin Luther King, Jr.. Amerikastudien/American Studies, Vol. 69, Issue. 3, p. 219.
Republican Senator Tom Cotton said US founders viewed slavery as a "necessary evil upon which the union was built". His comments were criticised as an attempt justify the slavery of black people.