The primary purpose of the selection is to convince readers that

To describe whether his purpose for writing is to inform, persuade, entertain, or explain his ideas to the reader.

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.