[Thibodeaux]

It’s not the constitution, it’s your interpretation

[central_va]

It is in the US Constitution.

Article 1 - The Legislative Branch

Section 8 - Powers of Congress

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;