The North got along with life by building factories to process items, they had no need for slave usage. In the south everything earned came from hard labor. Southerners wanted slaves and northerners thought otherwise. Many Northerners as well believed that if they freed the africans and helped them gain human rights that they can help them by voting for northern electorals
These <span>ups and downs in an economy are often referred to as</span> "business cycles". These cycles are to be expected and don't cause great alarm for economists or investors.
During the 1940s, the historical era in which you would most likely find an <span>abandonment of laissez faire economic policies in the United states. Hope this answers your question.</span>