Shouldn't that be promote the general Welfare of the United States. Common mistake.
I know this is petty but, it isn't a mistake. The first paragraph of Article 1, section 9 says the following;
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;No mention of the word "promote".
Just to reiterate though, providing for the "common Defence" and "general Welfare" are not powers in and of themselves. They are merely descriptive phrases meant to classify the specifically enumerated powers that are listed directly following those general terms.