H, anyone down to talk??

Draw conclusions  why might a cause like italian unification successfully draw people of very different backgrounds together?  

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

Which fact would this be, and how might you verify the truth?