The combination of better sanitation (safe drinking water, food, and disposal of waste), improved medical care, and reduced mortality rates for infants, children, and young adults accounted for this tremendous increase. Life expectancy in the United States in 1900 was 47.3 years; by 1970 it had increased to 70.8 years. By 2002 the National Center for Health Statistics projected that life expectancy for those born in that year was 77.3 years. (See Table 10.1.)
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