The Hatfields and McCoys were two families involved in a famous feud in the late 19th century in the Appalachian region of the United States. The conflict began in the aftermath of the American Civil War and was fueled by disputes over land, livestock, and personal grievances. The feud escalated into violence, resulting in numerous deaths and injuries on both sides. It became a symbol of family loyalty and revenge, capturing public attention and leading to various cultural representations, including books, movies, and television shows that depict the intense rivalry between the two families.