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Between 1820 and 1840, the American population increased about 7 milion from 10 million to 17 million. As the American industry had developed, the quality of American's life had also improved consequently: Epidemics declined in both frequency and intensity, which was a result of improvements in public health. The improvements in public health resulted in the low Death Rate and high Birth Rate of the American population, since women were able to be treated with a proper medication and medical techniques brought about by the American industrial revolution. As the result of the huge population growth, many small communities were expanded to bigger, major cities, Immigration from Europe increased, and transportation systems were improved and expanded, allowing Americans migrations to all over the nation.

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Q: What were the reasons for and the effect of the rapid increase in population between 1820 and 1840?
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