Answer is McCulloch v. Maryland
Step-by-step explanation:
Brown v. Board of Education was a Supreme Court case about how racial segregation in public schools is unconstitutional.
Obergefell v. Hodges was a Supreme Court case that required a state to license a marriage between same-sex couples.
Madison v. Mary bury was a Supreme Court case that made federal/American courts had the write to strike down laws they find to violate the constitution.