Ever since this nation’s inception, the idea of an open and ever-expanding frontier has been central to American identity. Today however, America has a new symbol to contend with—the border wall. In “The End of the Myth: From the Frontier to the Border Wall in the Mind of America,” Greg Grandin explores the role the frontier has played in US history―from the American Revolution to the War of 1898, the New Deal to the election of 2016. In this installment of “Leonard Lopate at Large” on WBAI, Greg Grandin discusses “The End of the Myth” and expands on what the contents of his book tell us about the current era of US history.