Answer:
To keep away other forces and was great for keeping invaders put
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The harsh living conditions in New York City slums
Engineering may be the sum
Mass production of goods resulted in the use of mechanization to have an oversupply. Some labor work were replaced by machines, which created unemployment and change of needed skills for an upgrade. Common work can be done by machines while the craft was still handed down to skilled workers. There was a high demand for buying machines that can reproduce products faster.
