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Answer:

Why did cities such as Pittsburgh and Louisville grow? As more settlers moved west, those farmers increasingly sent their crops to those cities, which were built along rivers, to get them to markets.

The cities like Pittsburgh and Louisville grow because farmers increased sending the crops to these cities.

What do you mean by a city?

A city refers to a large settlement that can be defined as a permanent and a place that defined boundaries.

Pittsburgh and Louisville grows because settlers moved to the west. After all, farmers sent their crops increasingly that were built along rivers to get more markets.

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