|
The mean center of the United States population is determined by the United States Census Bureau from the results of each census. The Bureau defines it to be: After moving roughly west by south during the 19th century, during the 20th century the shift in the mean center of population was less pronounced, moving west and south. The southerly movement was much stronger during the second half of the 20th century; 79% of the southerly movement happened between 1950 and 2000. ==Location info since 1790== The 19.8 mile shift projected for the 2010–2020 period would be the shortest centroid movement since the Great Depression intercensal period of 1930–1940.〔 ''Notes on the table data'' # In the first census (1790) the mean population center was near Chestertown, Maryland.〔 # The mean population centers of 1820, 1830, 1840 and 1850 were in what is now West Virginia, given West Virginia's split from Virginia in 1863.〔 # Computation method used until 1950. # Current computation method. # The addition of Alaska and Hawaii to the union moved the center about two miles (3 km) farther south and about ten miles (16 km) farther west in 1960.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mean center of the United States population」の詳細全文を読む スポンサード リンク
|