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the fist cncus was conducted in 1790. The population was about four million across the 13 first states
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the birth rate increased by almost 4 million in over 50 years.
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in the 1950's weman were expected to stay home and take care of the family. But by W.W.2 weman were working in factories due to shortag of man power. After W.W.2 the rate of working weman droped, but by the 1960's 35% of weman were member of labor force.
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The immagration rate as quadrupled in over 30 years from 9.6 in 1970 to about 38 million in 2007. 1,046,539 people were naturalized as U.S. citizens in 2008
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the 2000 U.S. population was 281,421,906 an increase of over 13% from 1990.