Why was the american party also known as the know-nothing party?

The Know-Nothing Party, also known as the American Party, was a prominent United States political party during the late 1840s and the early 1850s. The American Party originated in 1849. Its members strongly opposed immigrants and followers of the Catholic Church

It developed as a reaction to the impact of european colonialism in africa on peoples of african descent. in the  mid-20th century, activists in africa adopted pan-africanism as a rallying cry for independence from colonial rule. some african pan-africanists sought to unite the continent as one independenthope it was useful