It allowed for steel to be produced much more cheaply and efficiently, This made steel more available so enough is produced to build skyscrapers.
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After the last expansion, gold was discovered at Sutter's' Mill, bringing many more Americans from the East, and benefitting them greatly, even bringing in people from outside America. This revolutionized America's economy. Manifest Destiny brought money, land, resources, and a strengthened economy to the Americans.
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A