I saw
this on Twitter. Is Yglesias right that Hamlin would've enforced Reconstruction more than Johnson?
He'd probably have insisted on at least literate Blacks and Coloured Army veterans being given the vote.
That probably satisfies enough in Congress to get the South readmitted.
After that probably not a huge amount changed. As the Army shrinks back to peacetime levels, Reconstruction measures will become harder and harder to enforce, and eventually the North will get bored and abandon it, as OTL.