"[I]f the execution of the laws of the national government should not require the intervention of the State legislatures, if they were to pass into immediate operation upon the citizens themselves, the particular governments could not interrupt their progress without an open and violent exertion of an unconstitutional power. No omissions nor evasions would answer the end. They would be obliged to act, and in such a manner as would leave no doubt that they had encroached on the national rights."
- Federalist Paper No. 16