# What is preemption? | USLege > Preemption is when a state overrides or blocks a city or county's authority to regulate something itself, a recurring flashpoint in state legislatures. Canonical: https://www.uslege.ai/definitions/preemption --- Definitions # What is preemption? When a higher level of government blocks a lower one from regulating something itself, usually a state overriding what a city or county tries to do. ![Laura Davis](/assets/headshots/laura-davis-founder.png) By [Laura Davis](https://lauraluisedavis.com/), Co-Founder & Chief Business Officer at USLege. Former tech policy director and lobbyist, from D.C. to the states. Preemption is when a higher level of government passes a law that overrides, or blocks, a lower level of government from regulating something on its own. Most commonly this means a state legislature passing a law that strips cities and counties of the authority to set their own rules on a given topic. It shows up constantly in state sessions: short-term rental rules, minimum wage ordinances, plastic bag bans, zoning and land use, and increasingly tech and AI regulation all see preemption fights, where a state either affirms or removes local control. The same dynamic exists at the federal level, where federal law can preempt state law on a given subject. For a government affairs team, preemption matters because it changes who the real decision-maker is. A city council vote can become irrelevant overnight if the state legislature preempts the issue, which is why teams tracking local policy also need visibility into what's moving at the state level on the same topic. Track preemption fights as they move through state legislatures, live. [Book a demo →](/demo) ## Frequently asked Is preemption always about states overriding cities? That's the most common form, but preemption can also run federal-to-state, where a federal law blocks states from regulating a given area on their own. What topics see the most preemption activity right now? Short-term rentals, minimum wage and labor ordinances, zoning and land use, data privacy, and AI regulation are all active preemption battlegrounds in state legislatures. Why does preemption matter for government affairs teams? It changes where the real decision gets made. A local ordinance a team spent months on can be nullified by a single state bill, so teams tracking city or county policy need to watch the state level on the same issue too. Does USLege track preemption bills specifically? USLege tracks bills across state legislatures and local government bodies in one place, so a team can see a preemption bill moving at the state level alongside the local ordinance it would override. Can preemption go the other direction, cities overriding state law? No. Preemption flows from a higher level of government to a lower one; a city cannot preempt state law, only the reverse. How quickly can a preemption bill move through a legislature? It varies by state, but preemption bills are often prioritized and can move quickly, sometimes catching local officials off guard if they're not actively monitoring state activity. Does preemption always eliminate local authority entirely? Not always; some preemption laws set a floor or ceiling (like a minimum wage cap) rather than removing local authority on the topic completely. The specific bill language determines the scope. Are there federal preemption fights happening right now too? Yes, federal preemption of state law is active in areas like AI regulation, data privacy, and energy policy, mirroring the state-versus-local dynamic at a higher level. How can a local government fight back against preemption? Options include lobbying against the preemption bill directly, coalition-building with other affected localities, and in some cases legal challenges after a law passes, though remedies vary significantly by state. Does preemption activity follow any predictable pattern by state? Broadly, it tracks the state legislature's political composition relative to its major cities, but the specific topics in play shift with whatever policy area is nationally active that session. Can I get alerted specifically to preemption bills, not just any bill on a topic? Keyword and topic tracking on platforms like USLege can be tuned to catch preemption-specific language, though it usually requires setting up the right search terms rather than a single generic "preemption" filter. Is preemption a partisan issue? Not consistently; both parties have used preemption when it suits their state-level majority against cities they don't control, so the pattern is more about power than fixed ideology. Related [Legislative tracking for local government](/for/local-government)[How the legislative process works by state](/guides/legislative-process-by-state)[All definitions](/definitions)