Land redistribution would be the result of a decision to confiscate land rather than hang people who had made war on the United States (treason by the definition in the US Constitution) It might also have been linked to exiling say 15 000 previous prominent people from the slaveocracy
Please can you give a cite for when any attempt was ever made (or even seriously contemplated) to confiscate property or exile anyone, and in particular for any occasion when Hamlin proposed or supported any such measure?
As far as hanging is concerned, forget it. One thing we
do know about Hamlin is that he was a lifelong opponent of the death penalty, right from his first arrival in the Maine Legislature in 1835. It took him fifty years to win his point, but he lived just long enough to see Maine finally abolish capital punishment in the 1880s. There is no knowing far he would have taken this as President, ie whether Henry Wirz or the assassins of Abraham Lincoln would have got life imprisonment instead of death, but certainly no one else would have been in any danger of execution.
Nor, I repeat, have I ever heard anything to indicate that he favoured property confiscation. If you have, please tell us.
The Democrats could have ceased to exist because they would be unable to win in large parts of the South if everyone could vote.
Why should that cause them to cease to exist? Even OTL, they managed to win only four presidential elections between 1860 and 1928, yet they never came anywhere near disappearing. Why should winning slightly fewer races cause them to?
In any case, you would never get a South where "everybody could vote", since it would require a far greater effort than most people in the North were prepared to make. By 1876, the US Army was down to 27,000 men, of whom only about 3,000 could be spared for duty in the South. So, unless northern voters develop a sudden willingness to pay extra taxes to maintain a larger army than the US needs in peacetime, the means to suppress the KKK et al simply do not exist and can't be made to exist - regardless of who is President. As Mrs Rutherford B Hayes asked a critic of her husband's Southern policy "What was Mr Hayes to do? He had no army". An exaggeration, but not by much.