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| | United States - Psychology Central |
 | | Note that some cities not listed (such as Atlanta, Boston, Las Vegas, Miami, New Orleans, Seattle, San Francisco, and Washington) are still considered important on the basis of other factors and issues, including culture, economics, heritage, and politics. |
 | | U.S. defense expenditure is estimated to be greater than the next twelve largest national military budgets combined, although citing this figure can be controversial since it does not take into effect local-currency purchasing power ratios. |
 | | Some advanced societies were the Anasazi of the southwest, who inhabited Chaco Canyon (and built sandstone buildings with up to 5 floors), and the Woodland Indians, who built Cahokia, a city with a population of 40,000 at its peak in AD 1200, located near present-day St. |
| psychcentral.com /psypsych/United_States (8537 words) |
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