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The Industrial Revolution in the U.S. started in 1820
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Elias Howe invents the sewing machine in 1846 which can connect to child labor since children used these dangerous tools.
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Henry bessemer invents the bessemer process for making steel quicker and cheaper in 1855.
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During the Civil War railroads were very important and that was the invent of the transcontinental railroad.
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Thomas Edison invented the light bulb as well as DC electricity in 1879. Alexander Graham Bell and Thomas Edison invented the telephone in 1876.
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In 1883 after 13 years of building the Brooklyn Bridge opens and is known as the longest suspension bridge
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The Fair Labor Standards act was a law in 1938 that stated anyone under 16 or 18 will be paid minimum wage