Final answer:
The parol evidence rule preventing contradictory testimony to a written contract is true. The necessary and proper clause has not limited but expanded the power of the national government, making the statement false. It's true that the Treaty of Paris ignored the American Indians.
Step-by-step explanation:
The statement that the parol evidence rule generally precludes testimony that would contradict a complete written contract is true. The parol evidence rule is a legal doctrine in contract law that prevents parties to a written contract from presenting extrinsic evidence of terms of the contract that contradict, alter, or add to the terms of the written agreement.
Regarding the subject of the necessary and proper clause of the U.S. Constitution, the answer to the statement is false. The necessary and proper clause, found in Article I, Section 8, has in fact been interpreted to expand the powers of the national government, allowing it to make all laws deemed necessary and proper for executing its powers.