Two things that caused modernist writers of the 1920s to lose their faith in humanity and society were the horrors of World War I and the disillusionment of the postwar period. World War I exposed the brutality of modern warfare, leading many to question the morality of humanity. The postwar period was characterized by economic hardship, political turmoil, and a general sense of disappointment, which further eroded faith in humanity and society. These two factors, combined with other social changes of the time, led to a widespread sense of disillusionment and loss of faith, which is reflected in the works of modernist writers of the 1920s.