How could the differences of the north and south caused the civil war?

Well the main difference was that the South was using slaves while the north were already using machines and the north never used slaves

the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.

our current president donald trump