The primary cause of Europeans' anxiety about the future of their society in the early 1920s is: The Great war.
The Europeans' was worry about the future of their society because of the great war or World War I as they do not know what the outcome of the war will be in the early 1920s.
During the period of great war many lives were loss and many army loss their life.
Therefore the primary cause of Europeans' anxiety about the future of their society in the early 1920s is: The Great war.
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