What does the caption imply?

Which of harriet martineau’s books is a foundational treatise on sociological data collection?

Law which gave electricity to people living in the farm victory gardens boll weevil drought great depression franklin d roosevelt warm springs, ga new deal aaa - agricultural adjustment act ccc - civilian conservation corp rea - rural electrification adminstration ssa - social security act

Prior to the 1948 presidential campaign, truman won back the support of labor unions by highlighting his opposition to the taft-hartley act. supporting the passage of the national security act. pushing for equal rights for african american citizens. opposing the strikes of railroad and mine workers.