The invention of steel skeletons and elevators made building skyscrapers possible
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elevators
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An internal framework of steel girders allowed the building of tall skyscrapers.
Land is costly, by area, so building upwards means you can house far more offices etc in a compact "footprint".
all of the above are correct
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They made voting possible so we can chose our representatives
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The expansion of the American steel industry and railroads during the civil war was made possible by Andrew Carnegie. Mr. Carnegie was a Scottish American industrialists who is known for leading the steel industry expansion.