In 1837, Illinois blacksmith ________ developed a new steel plow that rapidly became popular.
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Q9: In five northern states, free blacks could
Q10: Agriculture and farming represented a small part
Q11: Northern farmers started using manure as fertilizer
Q12: The last link in the chain of
Q13: In Dartmouth College v. Woodward, the Supreme
Q14: Among antebellum American inventions were the McCormick
Q15: Farmers in the _ valley were leaders
Q16: By 1860, almost _ of the American
Q17: By 1830, _, Indiana, and southern Illinois
Q19: In 1860, _ percent of the American
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