There is no one clause addressing national (federal) government power. Practically the entire document is a collection of limits and blocks, and checks and balances set upon the power and authority of the federal government.
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The Necessary and Proper Clause of the Constitution has been used to strengthen the power of the national government. It is also known as the Elastic Clause.
The Elastic Clause is the clause in the Constitution that gives Congress the most general non specific power. It is in Section 8 of the Constitution.
elastic clause
elastic clause article 1 sec 8 allows the government flexibility to whatever problem arises
The elastic clause, which gives the Congress the power of executing "foregoing powers."