What was the issue in the supreme court case of plessy v. ferguson? what did the court rule? (be specific in ur answer)

Explain the reasons for u.s. neutrality during the 1920s and 1930s. how did ideas about neutrality change during the period from the end of world war i to the passage of the lend-lease act? be sure to include any events, terms, or people that may support your response.