What do states retain power to make laws about?

Anything not preempted by federal law.

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  1. Only traffic rules
  2. Only tax rules
  3. Anything not preempted by federal law ✔

Why: States retain plenary power to make laws covering anything not preempted by federal law.

Huh, didn't know that: States retain plenary power to make laws covering anything not preempted by federal law.

The dad joke
States have broad power unless federal law steps in.
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References

Answer: Anything not preempted by federal law. States retain plenary power to make laws covering anything not preempted by federal law.

  1. Law of the United States en.wikipedia.org/wiki/Law_of_the_United_States
    They retain plenary power to make laws covering anything not preempted by the federal Constitution
    Checked 2026-11-07.

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