Heres a wikibox from a world where the US lost the civil war after British and French intervention to help the CSA not only win but also take everything they ever wanted
This proves humiliating for the Republican party who is now seen as the party who lost the war, with the Democrats being seen as essentially a party full of traitorous sympathizers to the Confederacy by most.
As a result, Republicans do not nominate Lincoln in an attempt to rebrand itself and try to move away from the great humiliation of the civil war, while the Democrats nominate formerly pro war Democrats in an attempt to show that they are not the same party that allowed the Confederacy to be a thing, both worked to a certain extent, but Fremont decided that it was enough of these two parties, both whom failed the American people, and decided to try out a third party, the Radical Democracy Party, it was a far left party, even more so then the radical republican embracing Republican Party, America embraced this party as it was the only choice that noone could really object against, for despite the loss Fremont was still seen as a great general during the war, and a hero for the Union side despite it losing in the end. This was especially the case for the north and west of the country, who embraced him full on, while the rest of the country loved him but were barely able to beat him in close races, either for Seward or Seymour.
In the end the election came down to either Fremont takes New York or Congress decides the next president, it was extemely close, but in the end Fremont was barely able to edge out New York with everyone being within a percentage point of one another.
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Alright everyone, this is for a timeline Im considering doing, where basically after a huge defeat in the civil war the union breaks down into a multi party state and also a leftist imperialist power, basically wanting to create an empire of equality while the confederacy expands to the south of them after buying the American colonies of the British and French, making these two powers constantly competing with each other cold war style. This election is really what begins this process. What do you all think?