The article states that Richard Slotkin's Gunfighter Nation's depiction of cowboys and Native Americans under attack finds resonance in the disturbing images of U.S. Border Patrol Agents on horseback confronting Haitian migrants in Texas, exposing the enduring influence of the Myth of the Frontier and the history of racial violence. It mentions that the treatment of migrants raises questions about the true nature of homeland security and the boundaries of national identity.