It is the law but which law-federal or state law in the united states tnereane different layers of laes. At the top is federal law which congress makes for all people in its territory the united states then each state makes law about things in its territory the. Laws that eash state makes must not go agauirre federal laws counties and towns also make rules a town may require that you have a alicense for your bicucle for example here are some similarities and differences in state laws