A group opposed to immigration in the 1840s,they were known informally as the Know-Nothings.

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The American party, also known as the Know-Nothings, was a political movement that emerged in the 1840s and was opposed to immigration, particularly by Catholics. The party gained some support in the North and won some elections, but ultimately declined by the 1860s. The Whigs, National-Republicans, Democrats, and Federalists were other political parties that existed during this time period but were not associated with the Know-Nothings.

A Group Opposed to Immigration in the 1840s,they Were Known