The Know-Nothing Party was a political movement in the United States during the mid-19th century, primarily active in the 1850s. It emerged in response to the increasing number of immigrants, particularly from Ireland and Germany, and was characterized by its nativist sentiments. The party aimed to limit immigration and promote the interests of native-born Americans, often advocating for strict immigration laws and the exclusion of immigrants from political office. Members of the Know-Nothing Party were known for their secretive nature, often responding to questions about their activities with "I know nothing," which led to the party's name. The party gained significant traction in several states but eventually declined due to internal divisions and the rise of other political movements, particularly the Republican Party, which focused on issues like slavery and civil rights.