点图下方的年份标尺可以看到200多年的轨迹线。
http://2010.census.gov/2010census/data/center-of-population.php
Each decade, after it tabulates the decennial census, the Census Bureau calculates the center of population. The National Mean Center of Population based on the 2010 Census is near Plato, Mo., an incorporated village in Texas County.
The center is determined as the place where an imaginary, flat, weightless and rigid map of the United States would balance perfectly if all residents were of identical weight. In 2000, Edgar Springs, Mo., was announced as the new U.S. population center.
Historically, the center of population has followed a trail that reflects the sweep of the nation's brush stroke across America's population canvas. The sweep reflects the settling of the frontier, waves of immigration and the migration west and south. Since 1790, the location has moved in a westerly, then a more southerly pattern. In 2000, the new center of population was more than 1,000 miles from the first center in 1790, which was near Chestertown, Md.
- Re: Center of Population, 1790-2010posted on 05/10/2011
I wonder how they treated the native people. In the late 18th century their population distribution should be pretty significant, if they were counted in the census. - Re: Center of Population, 1790-2010posted on 05/10/2011
历史的步伐再迈大一些,就快到我家门口了:) - posted on 05/10/2011
gz wrote:
I wonder how they treated the native people. In the late 18th century their population distribution should be pretty significant, if they were counted in the census.
人口普查首先是个政治概念,然后才是统计。古时候查户口是为了收税,征兵,征徭役。美国搞的第一个现代意义上的人口普查,是为了民选和收税。也就是说,“人口”的定义首先是政治的。
这是1790年第一次人口普查的结果:
http://en.wikipedia.org/wiki/1790_United_States_Census
每十年一次的人口普查有个很重要的功能是为了重划选区。点击下图本州所在地,可以看到各县人口增长或减少情况。密西根算是死了。不知道为什么内华达人口增长那么快,35.1%,全国最快(10年间),集中在拉斯维加斯周围三个县,主要是少数民族增长,其中亚裔增长116.5%,Latino增长81.9%,这些人跑去那里做什么(10年间)?看了下面的分段图,没去看前几十年内华达少数族裔的变化情况。
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