thomas marshall becomes president
How does that change Versailles?
My understanding of Marshall is that he more or less shared Wilson's policy alignment but was, put simply, a lightweight who probably would have gotten less at Versailles and under whom the League of Nations might have bombed even harder in the isolationist-controlled Senate. IOTL his dithering when it came to jockeying for power with Wilson's wife after the President's stroke likely contributed to the treaty's failure in the Senate and the Republicans storming home in 1920.