Answer:
The corect answer is that the Supreme court decision that established that school segregation as unconstitutional was Brown v. Board of Education in 1954.
Step-by-step explanation:
A landmark decision in Topeka, Kansas were 13 parent in behalf of 20 children sued the Kansas Board of Education for them to change the segregation policy in the District. This became a very dimportant case that brought racial injustice to the forefront of the country.