Source: Europe and the People Without History, 1982, Chapter 11, The Movement of Commodities, p. 316.
“Nothing is proved by the expectation of some Northerners that the clause would eventually put an end to slavery, for there was widespread confusion of "slavery" with the "slave trade."”
Both American and British abolitionists assumed that an end to slave imports would lead automatically to the amelioration and gradual abolition of slavery.
The Problem of Slavery in the Age of Revolution, 1770-1823, page 129. https://books.google.com/books?id=9lsvDwAAQBAJ&pg=PA129
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David Brion Davis 1
American historian 1927–2019Related quotes

1860s, Cooper Union speech (1860)
Context: Some of you are for reviving the foreign slave trade; some for a Congressional Slave-Code for the Territories; some for Congress forbidding the Territories to prohibit Slavery within their limits; some for maintaining Slavery in the Territories through the judiciary; some for the "gur-reat pur-rinciple" that "if one man would enslave another, no third man should object," fantastically called "Popular Sovereignty"; but never a man among you is in favor of federal prohibition of slavery in federal territories, according to the practice of "our fathers who framed the Government under which we live." Not one of all your various plans can show a precedent or an advocate in the century within which our Government originated. Consider, then, whether your claim of conservatism for yourselves, and your charge or destructiveness against us, are based on the most clear and stable foundations.
Source: How Europe Underdeveloped Africa (1972), p. 136.

2000s, God Bless America (2008), Slavery and the Human Story
Context: But one may ask, how is it that slavery, or any other form of invidious discrimination, has played so great a role in American history? How could a nation, dedicated at its birth to the proposition that all men are created equal, have tolerated slavery and its effects so long? If we look to the long history of mankind, however, we will ask a different question. Slavery was lawful in every one of the original thirteen states. There was accordingly nothing remarkable in the fact that slavery was not abolished immediately on independence. What is remarkable is that a slave-owning nation would declare that all men are created equal, and thereby make the abolition of slavery a moral and political necessity. To accomplish that task would not be easy. We need to see the dimensions of that task to appreciate its difficulty.

Documentary films, America: Imagine the World Without Her (2014)

An Address to the inhabitants of the British Settlements on the Slavery of the Negroes in America., page 19
“The special interest of Muslims in sex slavery was universal and widespread.”
K.S.Lai, The Muslim Slave System in Medieval India, Aditya Prakasha, New Delhi, 1994. http://voiceofdharma.org/books/mssmi/ch12.htm Quoted in Easy Meat, Inside Britain’s Grooming Gang Scandal by Peter McLoughlin.
Muslim Slave System in Medieval India (1994)

Speech https://books.google.com/books?id=qMEv8DNXVbIC&pg=PA293&dq=%22Pro-Slavery+Rebellion%22&hl=en&sa=X&ved=0ahUKEwjtq-fys9zSAhWM4yYKHUaWBNIQ6AEIMjAE#v=onepage&q=%22Pro-Slavery%20Rebellion%22&f=false (January 1862)
1860s

Source: Sociology For The South: Or The Failure Of A Free Society (1854), p. 27-28