HUH?? That's in the preamble, there is no grant of power to "promote" the general welfare. Further, the General Welfare clause was/is a limiting clause on the taxing power, and it is for the States, meaning that no particular state was to be privileged above another. Even further, the general welfare is defined by the specific enumerated clauses. Not that it matters, as the US constitution was thrown out a long time ago.