“The United States was not the only nation to experience emancipation in the nineteenth century. Neither plantation slavery nor abolition were unique to the United States. But Reconstruction was.”
1980s, The New View of Reconstruction (1983)
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Eric Foner 24
American historian 1943Related quotes

1850s, The House Divided speech (1858)

Source: Charles E. Miller (2010) Conscience, Denied, p. 21

On the Irrepressible Conflict (1858)
Context: The Union is a confederation of States. But in another aspect the United States constitute only one nation. Increase of population, which is filling the States out to their very borders, together with a new and extended network of railroads and other avenues, and an internal commerce which daily becomes more intimate, is rapidly bringing the States into a higher and more perfect social unity or consolidation. Thus, these antagonistic systems are continually coming into closer contact, and collision results.
Shall I tell you what this collision means? They who think that it is accidental, unnecessary, the work of interested or fanatical agitators, and therefore ephemeral, mistake the case altogether. It is an irrepressible conflict between opposing and enduring forces, and it means that the United States must and will, sooner or later, become either entirely a slaveholding nation, or entirely a free-labor nation.

De Colores Means All of Us: Latina Views for a Multi-Colored Century (2017)

2010s, Why the Left Hates America (2015)

1830s, Illinois House Journal (1837)

Conclusion
1880s, Personal Memoirs of General U. S. Grant (1885)
Context: The cause of the great War of the Rebellion against the United States will have to be attributed to slavery. For some years before the war began it was a trite saying among some politicians that 'A state half slave and half free cannot exist.' All must become slave or all free, or the state will go down. I took no part myself in any such view of the case at the time, but since the war is over, reviewing the whole question, I have come to the conclusion that the saying is quite true.