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it's the telephone

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Q: What is the most profitable invention in US history?
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Why does Charles Goodyear's invention help us today?

because its profitable


What is the most profitable cereal in the US?

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What began to replace hemp as a profitable textile fiber in the US in the the late 1800s?

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What began to replace hemp as a profitable textile fiber in the US in the late 1800s?

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