Town Rule, State Law or National Law?
A single person lives under several layers of law at the same time. A rule about where you may park comes from your town, a rule about how old you must be to drive comes from your state, and a rule about sending mail comes from the nation. The United States is built this way on purpose. Power is divided between the national government and the state governments, a system called federalism, and states in turn give some powers to cities, towns, and counties.
Local governments make ordinances, which are rules for one community. Leash rules for dogs, the hours a park stays open, and the places where fireworks are allowed are common examples. State legislatures pass laws that apply across the entire state, such as requirements for licenses and rules for public schools. Congress passes federal laws about matters that concern the whole country, including coining money, running the postal service, and national defense.
What happens when two layers disagree? A town rule cannot contradict the law of its state, and a state law cannot contradict the Constitution or a valid federal law. The Constitution says that it, along with federal laws made under it, is the supreme law of the land. A court can decide that a lower rule must give way.
Knowing which layer makes a rule tells you where to take your ideas. If you want a crosswalk at your school, the town council is probably the place. If you want to change the age for a driver's license, you would look to the state legislature. Good citizens learn who is responsible for which decision, so they can be heard by the right people.