"The End of the Myth: From the Frontier to the Border Wall in the Mind of America" is a non-fiction book by Greg Grandin that explores the evolution of the American frontier myth from the 19th century to the present day. Grandin argues that the idea of the frontier, with its emphasis on expansion, individualism, and the conquest of nature, has been central to American identity and culture, but that it has also been a source of violence, inequality, and exploitation. He traces the ways in which the frontier has been imagined and mythologized in literature, art, and popular culture, and examines its impact on American politics, foreign policy, and immigration policy. The book also explores the history of the US-Mexico border, and how the construction of the border wall has become a symbol of the end of the frontier and the closing of the American mind. Overall, "The End of the Myth" is a provocative and insightful analysis of American history, identity, and politics that challenges readers to rethink their assumptions about the frontier and the American dream.