A long-held feud between two families, starting with a small conflict and leading to s larger one, would be best described as an Escalatory conflict spiral.
There have been many of these feuds, some of which were very nasty. Many times, a dispute that may have begun as a rivalry between two people or families erupted into a clan war or range feud with dozens or even hundreds of participants.
Family conflicts in America. The topic of historical blood feuds in America is covered in the book Feuds in the United States. There have been many of these feuds, some of which were very nasty.
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