The correct answer to this open question is the following.
The meaning of the constitutional clause that grants powers to congress has been defined as the "Elastic Clause."
This Elastic Clause is commonly known in US politics as the "Necessary and Proper Clause." Why is that? Because this clause allows the US Congress to have powers that are not properly mentioned in the Constitution. This clause has created controversy in the US because some people have questioned that Congress could abuse its powers over the other two branches or affect the citizens with one risky decision. But what has happened until now is that Congress has used the flexibility of this clause to perform their duties. You can find this clause in Article I, Section 8, Clause 18.