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smartypants342 smartypants342
  • 28-09-2016
  • Social Studies
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skyscrapers,railroads, and suspensions bridges were made possible by the

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PapuFranku
PapuFranku PapuFranku
  • 28-09-2016

They were made possible by the invention of steel

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LucyNeedsMathHelp
LucyNeedsMathHelp LucyNeedsMathHelp
  • 28-09-2016

The invention of steel, which was lighter and stronger than iron. Thanks for your question! Don't forget to rate and give me the brainliest answer! Then, I can help you with all your problems! ^-^ ~

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