Why is small manufacturing units dispersed throughout

A meaningful industrial dispersion program requires that units of productive capacity be broken down into smaller production units. and distributed to a larger number ... in small cities and towns throughout the country.

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years