US population distribution

Here is a map of population density in the US by county in 2000. It’s notable how uneven the distribution is. One thinly populated section is the strip directly on the Pacific coast from just north of San Francisco all the way to the Canadian border.  The border areas with both Canada and Mexico are both largely thinly populated as well.  The US is more urbanized that most of the world; UN data shows that the US has a very urbanized population, with 81% residing in cities and suburbs as of mid-2005 (the worldwide urban rate was 49%).

Source: Demographics of the United States

It seems that areas of continuous high density in the Eastern US coincide with the route of the old Erie Canal:

and the old Cumberland Road:

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