I always get amusement, about these types of discussions, minimizing, comparing slavery.
But never a mention of the abolition religion movement in the US, Canada, and Britain which called for an end of slavery.That movement was a basis for the Republican Party.
https://en.wikipedia.org/wiki/Abolitionism#:~:text=Abolitionism%2C%20or%20the%20abolitionist%20movement,trade%20and%20set%20slaves%20free.
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While seeking truth suggest you acquaint your self w/reality.
The implication that the moral objective of ending slavery formed the R Party is nonsense.
At Constitutional ratification in 1788, our Colonies, though largely rural, were morphing
into a more urbanized North while the South remained agricultural/rural.
As decades passed, this dichotomy increased w/the growth of a Northern Mercantile Class.
Further the South strongly supported Free Trade, which is why Great Britain was its powerful
ally, while the North was protectionist thru self-interest, promoting Duties, Excises and Tariffs.
This dichotomy grew wider for the rest of the century as the North became increasingly
industrialized, creating corporate leviathans, among them, Standard Oil and US Steel.
The Republicans were the benefactors and promoters of the business class from Fremont
of Cal. in 1856 to this very day. The notion that they were some sort of moral force promoting
racial equality is utter nonsense. Like all political entities, their core interest was economics.