Article I Section 8

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; 

To borrow money on the credit of the United States; 

To regulate Commerce with foreign Nations, and among the several States, and
with the Indian Tribes; 

To establish an uniform Rule of Naturalization, and uniform Laws on the
subject of Bankruptcies throughout the United States; 

To coin Money, regulate the Value thereof, and of foreign Coin, and fix the
Standard of Weights and Measures; 

To provide for the Punishment of counterfeiting the Securities and current
Coin of the United States; 

To establish Post Offices and Post Roads; 

To promote the Progress of Science and useful Arts, by securing for limited
Times to Authors and Inventors the exclusive Right to their respective
Writings and Discoveries; 

To constitute Tribunals inferior to the supreme Court; 

To define and punish Piracies and Felonies committed on the high Seas, and
Offenses against the Law of Nations; 

To declare War, grant Letters of Marque and Reprisal, and make Rules
concerning Captures on Land and Water; 

To raise and support Armies, but no Appropriation of Money to that Use shall
be for a longer Term than two Years; 

To provide and maintain a Navy; 

To make Rules for the Government and Regulation of the land and naval Forces; 

To provide for calling forth the Militia to execute the Laws of the Union,
suppress Insurrections and repel Invasions; 

To provide for organizing, arming, and disciplining the Militia, and for
governing such Part of them as may be employed in the Service of the United
States, reserving to the States respectively, the Appointment of the
Officers, and the Authority of training the Militia according to the
discipline prescribed by Congress; 

To exercise exclusive Legislation in all Cases whatsoever, over such District
(not exceeding ten Miles square) as may, by Cession of particular States, and
the acceptance of Congress, become the Seat of the Government of the United
States, and to exercise like Authority over all Places purchased by the
Consent of the Legislature of the State in which the Same shall be, for the
Erection of Forts, Magazines, Arsenals, dock-Yards, and other needful
Buildings; And 

To make all Laws which shall be necessary and proper for carrying into
Execution the foregoing Powers, and all other Powers vested by this
Constitution in the Government of the United States, or in any Department or
Officer thereof.