The Constitution's Supremacy Clause, which dictates that federal law is supreme, is at the heart of ongoing immigration disputes.

West Virginia now has a new tool to understand vaccine policies. The Vaccine Policy Atlas clarifies how federal vaccine recommendations affect state law and school immunization requirements.

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In the wake of Minnesota, several Democratic-led states are looking for ways to limit immigration agents' activities. Some Republican-led states are ordering local governments to cooperate with them.