It is understood that the Cumberland road, which was constructed at a great expense, has already suffered from the want of that regular superintendence and of those repairs which are indispensable to the preservation of such a work.  This road is of incalculable advantage in facilitating the intercourse between the Western and the Atlantic States.  Through it the whole country from the northern extremity of Lake Erie to the Mississippi, and from all the waters which empty into each, finds an easy and direct communication to the seat of Government, and thence to the Atlantic.  The facility which it affords to all military and commercial operations, and also to those of the Post-Office Department, can not be estimated too highly.  This great work is likewise an ornament and an honor to the nation.  Believing that a competent power to adopt and execute a system of internal improvement has not been granted to Congress, but that such a power, confined to great national purposes and with proper limitations, would be productive of eminent advantage to our Union, I have thought it advisable that an amendment of the Constitution to that effect should be recommended to the several States.  A bill which assumed the right to adopt and execute such a system having been presented for my signature at the last session, I was compelled, from the view which I had taken of the powers of the General Government, to negative it, on which occasion I thought it proper to communicate the sentiments which I had formed, on mature consideration, on the whole subject.  To that communication, in all the views in which the great interest to which it relates may be supposed to merit your attention, I have now to refer.  Should Congress, however, deem it improper to recommend such an amendment, they have, according to my judgment, the right to keep the road in repair by providing for the superintendence of it and appropriating the money necessary for repairs.  Surely if they had the right to appropriate money to make the road they have a right to appropriate it to preserve the road from ruin.  From the exercise of this power no danger is to be apprehended.  Under our happy system the people are the sole and exclusive fountain of power.  Each government originates from them, and to them alone, each to its proper constituents, are they respectively and solely responsible for the faithful discharge of their duties within their constitutional limits; and that the people will confine their public agents of every station to the strict line of their constitutional duties there is no cause to doubt.  Having, however, communicated my sentiments to Congress at the last session fully in the document to which I have referred, respecting the right of appropriation as distinct from the right of jurisdiction and sovereignty over the territory in question, I deem it improper to enlarge on the subject here.