These incidents , the most famous of which was the Hatfield-McCoy feud , were regularly featured in the newspapers of the eastern U.S. between the 1880s and the early twentieth century . These incidents , the most famous of which was the Hatfield-McCoy feud , were regularly featured in the newspapers of the eastern U.S. between the Reconstruction era and the early twentieth century , and are seen by some as linked to a Southern culture of honor with its roots in the Scots-Irish forebears of the residents of the area .