Tobacco, by far, was the most profitable of the Middle Colonies' cash crops, but indigo, cotton, and cereals (rye, wheat, corn) were also common.
1970s had slow economic growth and high inflation; things get more expensive while wages stay the same i. Immediate cause is the Vietnam War - caused deficit spending ii. Longer term cause is all that money being directed to the war was taken away from domestic spending
C. the north wanted to buy imported goods but the south produced cotton so they wanted the north to buy from them.