Supremacy Clause: This clause establishes that the Constitution is the supreme law of the land, giving authority to federal laws over conflicting state laws.
Intergovernmental Relations: This term refers to interactions and relationships between different levels of government (such as states and the federal government) regarding policy-making, cooperation, funding, etc.
Federalism: Federalism is a system where power is divided between central/federal authorities and regional/state authorities. It allows for shared sovereignty between these levels while maintaining their independence.