Feuds in the United States deals with the phenomena of historic blood feuding in America. These feuds have been numerous and some became quite vicious. Often, a conflict which may have started out as a rivalry between two individuals or families became further escalated into a clan-wide feud or a range war, involving dozens—or even hundreds—of participants. Below are listed some of the most notable blood feuds in United States history, most of which occurred in the Old West.