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5 October, 15:28

What social changes were most responsible for the 30-year increase in American life expectancy over the 20th century?

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  1. 5 October, 15:39
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    answer is given below

    Explanation:

    Social change refers to any significant change in behavior patterns and cultural values and norms over time

    so for 30 year in america they are as

    Better Sanitation Very little to do with the medical innovation Better distribution of wealth through eight working hour in a day GI Bill Tax on the personal income

    these were the some change
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