General vs. Specific
General: Military Defense
Specific: Taking money from Barney Fife and using it buy Aunt Bee a firearm.
General: Interstate Highway System
(also common defense as military needs roads to respond to threats)
Specific: Taking money from Barney Fife and using it buy Aunt Bee a car.
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"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; but all Duties, Imposts and Excises shall be uniform throughout the United States".
Congress has the authority to tax and spend for the general welfare, but the enumerated powers limit the federal government’s spending power to specific objects listed in Article I, Section 8.