Why were the nativists known as the know nothings?

The nativists were known as the "Know Nothings" because of the secretive nature of their organization, the American Party, which emerged in the 1850s. When members were asked about their activities, they would often respond that they "knew nothing," leading to the nickname. This group primarily opposed Immigration and the influence of Catholics, advocating for the interests of native-born Americans. Their platform reflected widespread fears about social change and the perceived threats posed by immigrants.