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Life expectancies in the United States rose dramatically in the past century due to

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vaccines, technology, medicines, health care, nutrition ,
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User Psicopoo
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One of the main reasons why life expectancy dramatically rose in the past century was due to different factors. One that surely contributed to them was better access to medical equipment and medical advances themselves. As well as better nutrition that was available to the common person. 
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User Roland Pheasant
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