IV-534 



and supports only one-fourth as much agriculture per unit area. 



In those regions lying between Cape Hatteras, N. C, and Canada 

 as well as in the Pacific Southwest, over 90 percent of the 

 population lives in urban areas; over much of the Atlantic 

 estuarine zone stretches the great northeastern megalopolis with 

 population densities averaging over 1,000 persons per square mile. 

 The remainder of the estuarine zone of the United States exhibits 

 a pattern of major centers of population clustered around natural 

 harbors and separated by stretches of coastline which are either 

 empty and inaccessible or beginning to be sprinkled with private 

 residences and resort communities in the vicinities of population 

 centers. 



The coastal counties have within their borders 40 percent of all 

 manufacturing plants in the United States. The mixture of manu- 

 facturing types in the estuarine zone is the same as the national 

 composition with only minor exceptions, such as the concentration 

 of the apparel manufacturing industry in the Middle Atlantic Region, 

 particularly in the New York area. Distribution of manufacturing 

 types among the biophysical regions shows regional differences 

 related to historical development as well as raw material and market 

 availability. 



Over half of all plants in the coastal counties and one-fifth of all 

 manufacturing plants in the United States are located in the Middle 



