What markets were growing in the North and East?

During the Industrial revolution, Railroad was one of the emerging markets in the North and Eastern part of United States

Explanation:

At the time, many businesses only able to sold their product locally. they did not have an efficient way to transport their product to other area of the states.

This caused the massive demand for railroads on both north and eastern part of United States. It's the most efficient/ fastest way of transportation that humans invented at that point of time (airplanes haven't been invented)/

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