The Hatfields & 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 after the American Civil War and escalated over issues such as land disputes, personal grievances, and differing loyalties. The feud gained national attention, leading to violent confrontations and numerous deaths on both sides. It became emblematic of family rivalries in American folklore and has been depicted in various forms of media, highlighting themes of honor, revenge, and the consequences of longstanding animosities.