Trade with foreign countries, between different states, and with Indian tribes
According to the Court, the Trade Clause grants Congress the authority to establish requirements and guidelines for business dealings, maintain open channels of commerce, and set standards for prices and terms of sale. Chief Justice John Marshall highlighted the power of Congress to regulate in Gibbons v. Ogden, saying: "It is the power to regulate; that is, to prescribe the rule by which trade is to be conducted." This authority, like all others granted to Congress, is total in itself, may be used to the fullest extent possible, and recognizes no restrictions beyond those outlined in the Constitution.
The power over commerce with foreign countries and among the various states is vested in Congress as absolutely as it would be in a single government, having in its constitution the same restrictions on the exercise of the power as are found in the constitution of the United States, if, as has always been understood, the sovereignty of congress, though limited to specified objects, is plenary as to those objects.
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