Lets say the Zimmermann Telegram never comes to light or Germany denies its real and the U.S. stays out of World War I. How would this impact American culture and politics for the future, namely the roaring 20s?
1) Germany wins the Great War with a POD that far late in the war. Britain and France losing the war means Wall Street is going to be very unhappy considering the amount of loans those two took out.
2) You won't see the same sort of surge in Germanophobia (Sauerkraut as liberty cabbage, people kicking weiner dogs, shutting down german schools, etc) that we saw OTL
3) More men will be wearing suspenders and have facial hair. WWI led to more men wearing belts (uniform reasons) and shaving their mustaches and beards (in order to fit in gas masks)
4) I've seen folks on this forum say that without US entry into WWI the socialist movement will be stronger. The issue is that the Russian Revolution is going to result in a red scare and the government going after socialists, just to less of a degree than OTL. Likewise, without US entry into the war we won't be seeing tax rates shoot up to fund the war. The highest individual tax rates went from 15% in 1916 to 77% in 1918. This proceeded to drop back to 25% in 1925, ergo the country never fully went back to the pre-war amount. Likewise, corporate tax rates shot up ten points and then never went back down. I can see socialists in the US being a bigger part of the progressive movement, but only relative to how small they were after Wilson was done with them.
5) 1920 will be a GOP win, albeit a smaller one. The Irish and German vote won't be as uniformly anti-democratic, but the end of the war and Wall Street not being able to collect on British and French debts is going to have negative economic repercussions. It won't be a return to normalcy campaign, but the GOP will probably win fairly handily.
I wonder if the US would intervene in the Russian Revolution if it isn't involved in Europe. Likewise, I wonder if Wilson will try to insert the US into the peace negotiations in Europe as a kind of fair broker.