Which of the following was a major economic shift in the North in the early 19th century?
a.) The north abandoned free-labor ideology just as the ideology was gaining influence in the
south.
b.) North-to-south river trade routes gradually replaced east-to-west railroads and roads.
c.) Traditional methods of production became mechanized and integrated into factories.
d.) The construction of turnpikes allowed for even faster transport of goods and people than
railroads did.