A state law required that all ships that docked in New York had to make sure they had a list of all the passengers that rode with them and also had to provide other personal information to New York. Miln decided not to comply with this law and the case was brought to the Supreme court.
The state of New York won this case. SCOTUS decided to uphold this law because a state has "the right to take all necessary steps to protect the health, safety, and welfare of its citizens." This law was later reversed in 1941.
Significance: It said that states had the ability to regulate commerce