Political conservatives were worried about people being upset due to the large number of US soldiers(117,000) who died fighting in WWI.
Politics from the conservative fraction were worried about possible riots which coud burst because of the large amount of casualties - approximately more than 205 000 wounded soldiers.
Conservatives feared social unrest, revolutionary movements, the loss of traditional values, the rise of totalitarian regimes, and new international tensions after World War I. These concerns stemmed from the economic hardships and political instability following the war. Their apprehension was confirmed by the later emergence of fascist and authoritarian regimes in Europe.
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