Answer:
Regulate Interstate trade.
Explanation:
The Constitution mentions 27 powers of Congress and there are also some implied powers, which are in Article I, Section 8, but congress cannot overrule the Supreme Court decisions.
Between the powers it is granted for the Congress the power to regulate interstate trade expressed in Article 1, Section 8, Clause 3 (Commerce):
"To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes."
