The main reason why democrats opposed the american system was because they believed it: benefited only certain regions in the nation. gave the government too large a role in the economy. forced small local banks to take unnecessary risks. made american goods more expensive than imports.

They opposed it because gave the government too large a role in the economy.
Giving the government too large of a role will killed the  desire to compete among organizations within the private sectors because the organizations that is backed by the government will give a competitive advantage among other competitors.