Germany, Italy, Japan
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It helped power the trains and steam boats.
North America was the closest comparison. The mongol empire covered 9.15 million square miles of land while North America covers 9.54 million square miles of land.
Answer: Eli Whitney
Explanation: In 1798 Eli Whitney built a firearms factory near New Haven. The muskets his workmen made by methods comparable to those of modern mass industrial production were the first to have standardized, interchangeable parts.