Which developments of the nineteen twenties contributed to an improvement in the American Standard of living. select 4 options.

The developments were the states, which grew over time creating better living for all US citizens.

thurgood marshall

explanation: in 1954, thurgood marshall and a team of naacp attorneys won brown v. board of education of topeka, kansas. in this landmark decision, the supreme court held that segregation in public education violated the equal protection clause of the fourteenth amendment.