mmercial, industrial, and social dependence which works itself
out to a large degree of fulfilment in spite of the obstructions
interposed by the contractedness and isolation of political
organization.

As we have seen, this dependence of one industrial section upon another,
and of one commercial centre upon another, as the result of commercial
and industrial specialization, is becoming more and more marked as a
development of human progress. All this increases the need for more
extensive political organization, while at the same time it makes it
possible.

It will readily be perceived that since industrial and commercial
development is necessitating dependence and unity, it is equally true
that the natural varieties of soil and climate are, also, conditions of
like dependence and unity. When these diversities of soil in different
sections are fully developed, and the exchange of products readily made
through improved commercial facilities, and human wants multiplied by
means of civilized culture, agricultural specialization creates the
demand, not for political division and isolation, but for more extensive
organization. That New England manufactures is no reason that she should
separate her government from that of the other States, but just the
reverse. That the Middle States are more distinctively a mining region,
and the great West agricultural, is no reason that their general
government should be distinct, but precisely the reverse. That the South
produces cotton, rice, and sugar, is no reason for her seceding from the
Union, but exactly the reverse. These diversified interests, we repeat,
create interrelation and dependence, unitizing the commercial and
industrial polity; and the political organization should, as far as
possible, be coextensive therewith. There are physical necessities which
prevent the formation and maintenance of a comprehensive political
organization in the earlier stages of civilization, but these never have
obtained in the United States, and every hour's improvement carries us
farther beyond them.

All the results of a progressive civilization are constantly
complicating the dependence and interrelation of various sections of our
country. Roads, railroads, canals, and lines of telegraph, by their
connections and intersections, are so many bonds of union between the
various districts of our country--so many bonds of union between the
various States of the confederacy--and forbid its dissolu