By the end of the 1940’s, how many states had laws requiring segregated schools?

following type of cultural development caused people to want and buy new products on the market :

worcester v. georgia, legal case in which the u.s. supreme court on march 3, 1832, held (5–1) that the states did not have the right to impose regulations on native american land. andrew jackson refused to enforce the ruling, the decision form the basis for most subsequent indian law in the united states.