First, they made settlement of the West possible after the Civil War by connecting farmers (and miners, ranchers, loggers, and others) to markets.
Second, railroads helped to integrate different regions of the country economically.
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the third option is the correct one
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all citizens must agree on all laws.
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Japan firmly established its culture in the country of Korea.
THe industrialization in Great Britain was a development of the first technologies that came out. The Steam Engine. Use of coal to make clothing out of cotton.
The industriliazation in China, has some of the most advanced technologies that are offered. These machines today are more effiecient.