Who were the people left out of the postwar boom? How do you account for their exclusion?

African Americans

Explanation:

African Americans  were the people left out of the postwar boom

African Americans and women were entitled to the same benefits as white men under the GI Bill, but often faced difficulty trying to claim their benefits due to discriminationThose who did manage to get benefits were often steered towards training for menial jobsThe frustration of African American veterans barred from participating in the postwar economic boom became a major motivating factor in the Civil Rights Movement