The main economic problem facing returning war veterans was

a. a shortage of jobs.

b. racial discrimination.

c. a lack of useful work skills.

d. postwar gloom.

The main economic problem facing returning war veterans was " a. a shortage of jobs," since the demand was very high for employment in the US after World War I, and the economy was in a recession.

The main economic problem facing returning war veterans after the Great War also known as World War I was that there was a huge postwar gloom which affected negatively all the people that played a role in it - D.