United States presidential election, 1920
Theodore Roosevelt/William Allen White - 40%, 140 electoral votes
Upton Sinclair/Hosea Blackford - 45%, 212 electoral votes
Charles Curtis/James Watson - 12%, 35 electoral votes
Notes: TR narrowly won New York State despite the rest of the Democratic ticket getting shellacked up and down the ballot.
The Republicans posted their best results in twenty years. They took Iowa, the quintessential farm belt state, narrowly won Kansas from the Democrats (the Socialists were, as usual, a nonfactor), and with Debs off the ballot, they captured Indiana, which shared with Missouri the distinction of the most closely divided state in the Union.
In addition to the mining states of West Virginia, Montana, and Nevada, the Socialist strongholds of New Jersey, Illinois, and Wisconsin, and a host of industrial and farm states, the Party came close in Massachusetts and Rhode Island to capturing a New England state for the first time ever, and won their first electoral votes on the Pacific coast. (They probably would have won Washington in 1916 as well, but the bloody suppression of the radical Seattle longshoremen by the Navy and state police cost them thousands of votes.)
Despite a healthy popular vote margin, the election would have been thrown into the House if Pennsylvania, which Sinclair took with less than a majority, had gone the other way. (Illinois and Ohio could have swung the election also, but the Socialists won those much more comfortably thanks a larger Republican vote west of the Appalachians.) Walter McKenna, the Philadelphia machine leader who had been dropped from the ticket, claimed that TR would have won if he'd been kept on. That may be true, but Pennsylvania's swing is more likely to be due to the mobilization of the Pittsburgh steel workers, and the devastation of the Democratic-leaning Susquehanna Valley.
Analysis of the votes of former Confederates in the newly acquired territories is mixed. A large majority of these men had been Whigs, and would seem to be natural conservatives, but a significant protest vote against TR is visible in these results. On the other hand, former Radical Liberals seem to have split their ballots evenly between the Democrats and Socialists, making it a wash. (Of the new territories, only Kentucky had anything other than a marginal number of white Socialists.)
Thanks to Turquoise Blue for the map template.