Which court decision declared that segregation was legal ?

the Supreme Court ruled that racial segregation of schools was unconstitutional.

Explanation:. In Brown v. Board of Education, which was litigated by the NAACP Legal Defense and Educational Fund, a unanimous Court declared segregated education systems unconstitutional

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the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.

to keep us neatruel and not get involved in any wars

he assumed control of treaty negotiations with a hostile power