In the United States, the share of wage and salary for workers who:
belong to unions
declined sharply in the 1930s and 1940s.
rose sharply in the 1930s and 1940s.
rose sharply in the 1950s and 1960s.
declined sharply in the 1940s and 1950s.
Not sure what the question is. Maybe why all this happened but that’s a guess at best. Also you said it declined sharply and rose sharply in the 1930s and 1940s. Please clarify and ask a more concrete clear question. Sorry I couldn’t be of more help.
