Final answer:
A legal resident of New Jersey must be licensed in New Jersey, as state residents are subject to state jurisdiction and state-specific licensing regulations.
Step-by-step explanation:
A motorist who is a legal resident of New Jersey must be licensed in New Jersey. According to the principles of state sovereignty and residency in the United States, as outlined in the question reference, residents are subject to the jurisdiction of the state in which they live. Therefore, a New Jersey resident must obtain their driver's license from the state of New Jersey, as each state has its own licensing regulations and requirements.