How did railroad building lead to increased division between the north and south?
a) the south had no interest in building railroads and saw the north as destroying the landscape by initiating them.
b) the south needed railroads to expand markets for their crops, but northern businessmen refused to invest there.
c)the north was increasingly a manufacturing economy and tied with the west, while the south remained agrarian.
d)the north built railroads to the west to encourage settlement there by those who were against expanding slavery.