preemption
The preemption doctrine is the idea that a higher authority of law will displace the law of a lower authority of law when the two authorities come into conflict.
state government
sovereign immunity
Sovereign immunity is a common law doctrine under which a sovereign (e.g., a federal or state government) cannot be sued without its consent. Sovereign immunity in the United States was derived from the British common law, which was based on the idea that the King could do no wrong.
wex