With the ability to forge iron tools, farming tools were more effective and provided a greater production and effectiveness. More food produced means that more people are able to be fed and consequently establish and work in the land. With a higher population and food cap, West Africa settlements were able to grow.
Answer:
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The piece of legislation which created the basic unit of settlement in the territory of north of the Ohio River is the Ordinance of 1785
The correct answer here is the last option
Mahan argues clearly that a strong navy is required in order for United States to expand far beyond its shores and its territory in order to become a super power. Manifest Destiny is a belief that first referred to the destiny of the settlers to spread across North America and later beyond. Here Mahan says that in order to do that the government needs to provide supply points for its navy.
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I would say it has to be trade