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Crop rotation was invented by George Washington Carver in the early 16th century. This allowed for crops to be planted after other crops which were very efficiently decided depending on the weather and depending on which crops grow best after certain crops. This became very helpful, leading to an increase production of crops and increasing the population.

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A monopoly was a situation where a single person or company holds control over a resource, industry, market and even economy. Many people had their own monopoly's due to having good money.

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Labor Unions were groups of people often workers within the same industry/company that come together in order to discuss with their employers some terms of employment such as wage, hours, conditions and much more.

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Slums were a populated/crowded area, such as urban with substandard housing. There places had rough conditions such as poor sanitation, overcrowding,

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Mass production is when there is a good that there is a lot of being made of leading to a great amount being produced.