Federal Trademark Registration gives national protection, and puts parties on notice of the trademark across the nation. State Trademark Registration can put parties on notice on a statewide basis, and can give some protection against infringement. However, merely registering a trademark in a single state will give no protection against infringement in another state. Furthermore, if a company does not register a trademark federally, the company may find it's precluded from expanding with the trademark to other states, where competitors are already using the mark.