How did issues such as regional economic disparities, the debate over tariffs, views on slavery, regional identities, and the concept of manifest destiny contribute to the deepening divide between the northern and southern states?
a) These issues promoted unity and collaboration between the northern and southern states.
b) These issues had no significant impact on the division between the northern and southern states.
c) These issues intensified tensions and conflicts, deepening the divide.
d) These issues led to the establishment of a common economic system.