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Depopulation of the Great Plains : ウィキペディア英語版 | Depopulation of the Great Plains
The Depopulation of the Great Plains refers to migration of people from the rural areas of the Great Plains of the United States to urban areas and to the east and west coasts. This phenomenon of rural to urban migration occurred in most areas of the United States but was especially pronounced in the Great Plains where many counties have lost more than 60 percent of their population. Depopulation began in the early 1900s, accelerated in the Dust Bowl years of the 1930s and has continued through the most recent census of 2010. ==Geography==
Definitions of what land comprises the Great Plains of the United States differ, but the Plains consist of all or part of ten states: Colorado, Kansas, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas and Wyoming. The eastern boundary is about 97 degrees W longitude and the Plains extend westward to the Rocky Mountains and southward from the border with Canada to the approximate latitude of Austin, Texas.〔Wishart, David. 2004. "The Great Plains Region", In: ''Encyclopedia of the Great Plains'', Lincoln: University of Nebraska Press, pp. xiii-xviii. ISBN 0-8032-4787-7〕 A somewhat more restrictive definition by the US Census Bureau gives a total area of the Great Plains in the United States as , 18 percent of the area of the U.S.〔Wilson, S.G., ("Population Dynamics of the Great Plains, 1950-2007" ), accessed 7 May 2013〕 The Great Plains are distinguished by generally flat land and a natural vegetation cover consisting mostly of grassland. The eastern part of the Great Plains is often intensely farmed with wheat being the most important crop. The western part is rainfall-deficient and primarily used for grazing cattle and irrigated agriculture.
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