What was one instance in which the federal government forced a state to act against its own wishes?

One instance in which the federal government forced a state to act against its own wishes was during the Civil Rights Movement, specifically with the integration of schools. The Supreme Court's ruling in Brown v. Board of Education in 1954 declared racial segregation in schools unconstitutional, and the federal government enforced this decision through measures such as the deployment of federal troops to ensure compliance with desegregation orders in states like Arkansas. This demonstrated the federal government's authority to intervene and enforce national laws even when facing opposition at the state level.