Final answer:
Plessy v. Ferguson strengthened Jim Crow laws, setting the precedent for segregation until Brown v. Board of Education overturned it.
Explanation:
The court case that strengthened the Jim Crow laws was Plessy v. Ferguson. This landmark 1896 Supreme Court decision established the doctrine of 'separate but equal' which allowed racial segregation to be constitutional. It was later overturned by the 1954 Brown v. Board of Education ruling, declaring segregation in schools unconstitutional.
Learn more about Jim Crow laws and segregation in the United States here:
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