"Favoring Republicans over Democrats in 1889 was all about white supremacy" is...um...quite a take.https://twitter.com/LemieuxLGM/status/1293679799307653120 …
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As a rule, you don't make a claim that big without mentioning the evidence, if you have any.
See pp. 83-8 of the paper I cited. The Republican expansion of the Senate with barely populated western states was inextricable from their abandonment of civil rights: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2483355 …
What is still conspicuously absent from that paper is any evidence - contemporaneous or otherwise - that anybody at the time saw the admission of new states as a reason not to act against Democrats in the South.
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