It's significance is not that is it in the preamble, and for the third time and last I will point out, the phrase is in Article I, Section 8, Clause 1, to wit:
Article I, Section 8: Congressional Powers specifically enumerated in the Constitution. The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises, to pay the Debts and provide for the common Defence and general Welfare of the United States;
Either you failed 8th grade US History or you haven't yet made it there....
Article I sec 8:1 provides Congress the power to spend; article 1 Sec 9:7 requires that all spending must be appropriated by Congress thru legislation.
The next 16 clauses specify in what areas Congress has the power to act
The last clause gives Congress the power to create legislation to affect these actions, including the power create legislation to appropriate funding.
There you go.
You LIE!!!! There, is that better than, Fuck you, moron? The truth is, Art. I, Sec. 8, clause 1 begins in this manner, and I quote:
"The Congress shall have power to lay and collect taxes, duties, imposts and excises, to pay the debts and provide for the common defense
and general welfare of the United States; but all duties, imposts and excises shall be uniform throughout the United States;..."
Now, I'm heading off to the dog park, where the dogs play and both their owner families and they are much more interesting and one hell of a lot better informed than you.