What is the feud betten the grangerfords and the sheperdsons?

The feud between the Grangerfords and the Shepherdsons in Mark Twain's novel "The Adventures of Huckleberry Finn" is a long-standing, violent conflict rooted in a dispute over land and honor. The two families have been engaged in a bitter rivalry for generations, with members on both sides perpetuating the cycle of violence through acts of revenge and retaliation. Twain uses this feud to satirize the senseless nature of such conflicts and to comment on the destructive impact of societal norms and prejudices.