Answer: Under the federal system, the final authority is the constitution.
Explanation:
The mentioned candidates above are formally nominated by the national party conventions. A United States presidential designating convention is a political tradition held at regular intervals in the United States by the greater part of the political gatherings will's identity handling chosen people in the up and coming U.S. presidential decision.
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the answer is The Tennessee Valley Authority which is a federal operation created on 6/18/1933-34 during the great depression by the congressional charter.