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The absence of... through the first half of the 19th century meant that the slums were plagued by sanitation problems, leading to the spread of water-borne diseases such as...and ..., which became endemic for several decades. Around the middle of the century (1820s-1840s), the situation was so dire in the slums that life expectancy decreased...to ... In the countryside, life expectancy in the 1840s was about ...
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