Answer: The Purchase enabled Carnegie to discover a more efficient production method.
Explanation: This is true because through the Bessemer Process (which he learned in Europe), he was able to process and mass produce the material, making it stronger and more inexpensive. As a result, the material spread and was used to build multiple buildings, the base for the Statue of Liberty, and promoted the construction of Skyscrapers.
Ancient cyanobacteria released oxygen which assisted in creating the atmosphere as we know it today.
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Some of the negative aspects were the working conditions, child labor, unsafe food conditions. people were migrating to the cities where living quarters were tight, education was lacking with very few graduating from high school as they needed to work to help support the family. Racial inequality was on the rise with seperation of people based on where they immigrated from as well as the color of their skin. Monopolies were formed .