How did european immigration change in the time up to civil war?

Prior to the Civil War, immigration was surging in particular from Germany, Ireland, and some Nordic countries.

During the 1830's-1850's, the US experienced a surge of new immigrants coming to the US looking for work. The market revolution offered opportunities for unskilled, poor immigrants to get jobs. those with more money were able to take advantage of new lands opening in the west (now Mid-west) for cheap.

Irish immigrants tended to be poorer and would come to the urban areas to settle and look for jobs. They created neighborhoods suited to their culture. Nativist groups formed in reaction to the new immigrants in particular the Irish. They were seen as unclean and as low in status as free blacks. Germans and those from Nordic countries tended to have more money and were skilled in farming. These groups came for cheap land and would make up the populations of Wisconsin, Illinois, Iowa, Minnesota, Indiana, and Ohio. Those that could buy land were able to create ethnic communities and were not bothered by nativist groups as much as those settling in the cities. During the years of the war, immigration slowed to a halt and would revive again to a full roar after the war ended.

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after the french-indian war.