Final answer:
According to the U.S. Constitution, Congress has the authority to levy taxes. This power is referred to as 'the power of the purse.'
Step-by-step explanation:
The authority to levy taxes is given to Congress according to the U.S. Constitution. Article I, Section 8 of the Constitution specifically grants Congress the 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. This power is commonly referred to as 'the power of the purse.' Congress controls the money by setting taxes and authorizing the expenditure of federal funds.