220 years of US population changes in one map
发布时间 2014-08-05 13:59:55 来源
摘要
Every 10 years, the Census Bureau calculates the exact center of the US population. Here's what that statistic shows about our history.
Further reading: 21 charts that explain how the US is changing
http://www.vox.com/a/how-the-us-is-changing
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