A 1859 NYT editorial scolding abolitionists as unreasonable and doing harm to the cause...

[moondust]

4. 18 years later

the Compromise of 1877 resulted in the United States federal government pulling the last troops out of the South, and ending the Reconstruction Era.

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Some black Republicans felt betrayed as they lost their power in the South that had been propped up by the federal military, and by 1905 most blacks were effectively disenfranchised by the now-democratically elected state legislatures in every Southern state.
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Leaving emancipation up to "the Slave States themselves" was one of the biggest mistakes in U.S. history.