Assuming that for whatever reason World War I does not break out, how does this effect American politics? Before the Great War and subsequent state clampdown on the socialist movement, Debs got his highest showing ever in 1912 with 6% of the vote. Do the Socialists continue their upward movement in the polls, possibly knocking the Democrats to third party status?
Without a war to run on not being in, does Wilson lose in 1916? Who do the Republicans nominate? How well do the Socialists do in 1916, and who do they nominate?
What other possible butterflies could we see happening from a 'No WWI' in American politics?