Recall the antebellum struggle over slavery in the nation’s capital 25 years before the Civil War, in which the free people of color and white abolitionists injected the anti-slavery agenda into national politics over the violent objections of Francis Scott Key and the (proto-Trump) Jacksonian majority.
Recall the great Founding era monoculture of Puritans, Scotch Irish, New Amsterdam Dutch, Quakers, and enslaved Africans, and the late 19th Century monoculture of California gold miners, Lafayette Cajuns, Irish Catholics, German protestants, Chinese laborers and Mormons?