States in the east, many of them established before detailed surveys had been done, were often set up using rivers as easily defined natural borders. States in the west were laid out much later when it was easier to draw a line on an existing map of the area.
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States in the east, many of them established before detailed surveys had been done, were often set up using rivers as easily defined natural borders. States in the west were laid out much later when it was easier to draw a line on an existing map of the area.