Clause 3: To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes;
Clause 18: 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.
And for extra credit, can you tell me what this means?
Clause 6: To provide for the Punishment of counterfeiting the Securities and current Coin of the United States;