What were the beliefs of the philosophers regarding society?

How did the roaring 20s mark the end of the progressive era? a. mass production reduced wealth disparity and turned public opinion pro business b. labor unions won big legislative gains in workers rights and disbanded c. public officials cut taxes on businesses and reduced spending on services d. america increasing influence in world affairs redirected public attention to foreign policy

What was the main point of truman doctrine ?

What directive in source a might have been at the root of the action described in source b?