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Traders moved their goods across the Sahara in large groups called caravans. Camels were the main mode of transportation and were used to carry goods and people. Sometimes slaves carried goods as well. Large caravans were important because they offered protection from bandits.
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The transcontinental railroad transformed the west because it made the idea of manifest destiny so much easier to achieve. The railroads also gave access to many trade spots, which in result connected them all, making the economy of America BOOM.
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Life in the city got affected by new factory owners providing important services like garbage collection to city residents, fast urbanization lead to overcrowding and spread of disease, as factories expanded and cities grew, so did police and fire protection
