Answer: Iron
Explanation: Britain had large and accessible supplies of coal and iron. Two of the most important raw materials used to produce the goods for the early Industrial Revolution.
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The irrigation of crops in Mesopotamia led to the salinization of the soil which ultimately led to the decline of Sumer. The answer is therefore, A.
The notion of Manifest Destiny held that the United States was destined to extend its power, spreading its way of life and democracy all over North America. This expansionism brought new territories but there were disagreement on the slavery issue: while abolitionists would, at first, tolerate slavery in existing territories they did not want the new territories to be slave territories; the economy of the South was , however, heavily based in slave work. This disagreement impacted the conflicts of the Civil War.
When the people are calm and don't argue with each other, and when they get along with each other by agreeing with each other and cooperating