The Supreme Court case Gibbons v. Ogden showed that

In Gibbons v. Ogden (1824), the Supreme Court ruled that Congress’s power to regulate interstate commerce overrode a conflicting New York steamboat license law. This established that federal law takes precedence over conflicting state law, so the correct choice is “federal law was superior to state law.” The case did not eliminate all state power to regulate commerce or business licenses.

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