Final answer:
The Supreme Court's Plessy v. Ferguson decision upheld the practice of 'separate but equal' and allowed for racial segregation in public accommodations on the condition that both races were provided with equal facilities. This decision remained in place until the Brown v. Board of Education case in 1954, which declared segregation in public schools unconstitutional.
Step-by-step explanation:
The Supreme Court's decision in the Plessy v. Ferguson case reinforced the doctrine of 'separate but equal,' which allowed for racial segregation in public accommodations. The Court ruled that as long as the facilities were equal for both races, segregation did not violate the principle of equal protection. This decision had a significant impact on the legal practice of segregation and was not overturned until the 1954 Brown v. Board of Education case.