At the same time as the "Red Scare," the USA was experiencing the worst racial violence in its history. Hundreds were killed. Some claimed, without evidence, that the Bolsheviks were behind it.
Labor unrest, racial violence, and anarchist bombs were blowing up across the USA in 1919, making many people wonder if the Bolsheviks were behind it all.
Political violence in Mexico tapers off after the new constitution comes into effect, although Venustiano Carranza will not give up power willingly.
The technological end economic changes wrought by the Great War will have major impacts even on nations that remained neutral.