“Always there had been the complicated factor of the one institution that peculiarly set the South apart from the North, slavery”

1920s, The Reign of Law (1925)
Context: This increasing unification has well-nigh obliterated State lines so far as concerns many relations of life. Yet, in a country of such enormous expanse, there must always be certain regional differences in social outlook and economic thought. The most familiar illustration of this is found in the history of slavery. The Constitution did not interfere with slavery, except to fix a time when the foreign slave trade should be abolished. Yet within a generation the country was confronting a sharp sectional division on this issue. Changing economic conditions made slavery profitable in the south, but left it unprofitable in the north. The resulting war might have been avoided if the south had adopted a policy of ultimate abolition. But as this method was not pursued the differences grew sharper until they brought on the great conflict.

Letter to his father-in-law, Frederick Dent (19 April 1861)
1860s

Speech to the Virginia Convention (1861)

Source: 1880s, Personal Memoirs of General U. S. Grant (1885), Ch. 16.
Context: The Republican candidate was elected, and solid substantial people of the North-west, and I presume the same order of people throughout the entire North, felt very serious, but determined, after this event. It was very much discussed whether the South would carry out its threat to secede and set up a separate government, the corner-stone of which should be, protection to the 'Divine' institution of slavery. For there were people who believed in the 'divinity' of human slavery, as there are now people who believe Mormonism and Polygamy to be ordained by the Most High. We forgive them for entertaining such notions, but forbid their practice.

First Week, Second Day. Compare: "From north to south, from east to west", William Shakespeare, A Winter's Tale, act i. sc. 2.
La Semaine; ou, Création du monde (1578)

1860s
Context: I never was an abolitionist, not even what could be called anti-slavery, but I try to judge fairly and honestly and it became patent in my mind early in the rebellion that the North and South could never live at peace with each other except as one nation, and that without slavery. As anxious as I am to see peace established, I would not therefore be willing to see any settlement until the question is forever settled.

Letter to Elihu Washburne (30 August 1863)

Source: The Boys Of Summer, Chapter 1, The Trolley Car That Ran By Ebbets Field, p. 36

Savitri Devi, Souvernirs et Réflexions d'une Aryenne, p 273, quoted in Koenraad Elst: The Saffron Swastika, p. 561

The Adolescent Society (1961), p. 337. New York: Free Press.