The Supreme Court case Gibbons v. Ogden showed that federal law was superior to state law.
states have no power over business licenses.
federal laws regulate business competition.
states cannot regulate commerce.

Federal law is superior to state law.

Explanation:

Gibbons V Ogden is a hallmark of the Commerce claws in the Constitution. The argument of does congress have power over interstate navigation (especially for hire such as on steamboats in this case) The Supreme Court ruled Yes, Federal liscenses/regulations are controlled by the federal court under the commerce clause. And also more clearly solidifying the suprememacy clause (Federal law always supersedes state law)

Which in turn expanded Federal regulating power by asserting that

"interstate commerce was a power reserved to and exercised by the Congress under the Commerce Clause. As interstate navigation fell under interstate commerce, New York could not interfere with it, and the law was therefore invalid. " - Chief Justice John Marshall