Answer and explanation:
<u>The main difference between the economy in the southern United States from the economy in the northern United States in the nineteenth century was the fact that the southern states' economies relied upon agriculture and not manufacturing.</u> After 1800, southern plantations' chief crop was cotton, which was also the country's chief export. Forty years later, industrialization opened up a lucrative domestic market. Northern states were the ones to quickly shift from agricultural to industrial. Power-driven machines were used and, by 1860, the United States was behind only France and Great Britain in manufacturing.
I would say A. Canada cause it’s at 2nd place for being United States largest trading partner.
Answer:
D. Article
(if you mean secondary source to know what happened in history)
