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"No Money shall be drawn from the
Treasury, but in Consequence of Appropriations made by Law; and a
regular Statement and Account of the Receipts and Expenditures of all
public Money shall be published from time to time."
~ARTICLE I, SECTION 9, CLAUSE 7
This clause of the US Constitution gives congress the "power of the purse." The power of the purse is a phrase that means one entity, such as congress, has the power to control other entities by controlling funding directly, or by attaching stipulations on how other monies are spent.
For example, to encourage states to raise the legal drinking age to 21 at a time when it was 18 in most states, Congress cut off highway funds to those states that did not raise the age requikrenet for the purchase of alcoholic beverages.