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Immigration drastically increased in the United States during the period between the Civil War and the early 1900s. This immigration boom coupled with increased development and industrial output following the Civil War led to large economic growth in the United States as well. 
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During the civil war and the early 1900's immigration became more popular. This is because people of other countries saw that there were people fighting for the rights of slaves as well as they should take advantage of a divided country in order to find a new more economically stable country to live in. 

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