Answer :
It should be noted that the site factor that best explains the linear pattern of urbanized areas like Washington, D.C., is abundance of deep-water harbors and waterfalls.
What is the site factor of the linear pattern of urbanized areas?
The site factor that influence the pattern especially in Philadelphia, New York, and Boston is the deep-water harbors and waterfalls.
And this area is flat coastal plains met higher lands is it extends to Washington, D.C
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