The first response is the most accurate and best analyzes the impact of the Supreme Court case rulings:
"Plessy v. Ferguson created the separate but equal doctrine and Brown v. Board ended the separate but equal doctrine in public education."
This response correctly identifies that Plessy v. Ferguson established the legal basis for racial segregation under the principle of "separate but equal," which sanctioned discriminatory practices for public facilities, including schools. In contrast, Brown v. Board of Education ultimately overturned that doctrine specifically in the context of public education, declaring that segregated schools were inherently unequal and therefore unconstitutional, thereby advancing individual freedoms and equal protection under the law.