What is the one power found in found in one but not the other two of the following: Declaration, Constitution, Articles of Confederation?

There are many powers that are found in the Constitution
that are not in either of the other two documents.  This is because neither of the other
two documents was meant to give much power at all to the national government.  The
Declaration of Independence essentially gives no powers to anyone.  It is not about
giving powers, it is about declaring why the colonies want to break from England.  The
Articles do create a government, but the national government has very little in the way
of powers.  In the Constitution, many powers are given to the national government that
are not given in either of the other documents.

Some of the
most important of these are

• The power to
  tax


• The power to regulate commerce between the
  states


• The ability to have an executive branch headed by
  a strong president


• The power to have national laws
  supersede state laws

All of these are given by
the Constitution but not by either of the other documents.