Final answer:
Ernest Hemingway and other Lost Generation writers depicted psychological alienation after World War I in their works, reflecting their own sense of disillusionment and society's estrangement. Fitzgerald describes his coping through imaginary heroism and exhausting business, mirroring the decade's sense of escapism and the quest to overcome disillusionment.
Step-by-step explanation:
The theme of the psychological alienation caused by war is reflected in the sentences that discuss the pervasive sense of disillusionment and hopelessness among the intellectuals after World War I. Writers like Ernest Hemingway and F. Scott Fitzgerald, among others, expressed this through their works, often skewering the middle class and portraying characters who felt alienated from society. Hemingway's experiences as an ambulance driver and his travels to cover various wars contributed to the colorful, yet tragic scenes in his novels which often showcase characters grappling with the displacement of their masculine identities due to the war's trauma.
Fitzgerald describes his life in the 1920s as one where his 'juvenile regrets' and 'big problems of life seemed to solve themselves' due to living through imaginary heroism and exhausting business, reflecting the decade's reality characterized by young people trying to grasp and overcome disillusionment and escapism.