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The root cause(s) of the accusations and the behavior of the "afflicted" (if you will) are lost to history: some suggest there was a feud between two of the families involved, which implies simple revenge, but in any case, nothing can be proved. Let's assume for the moment that the young women who showed what were judged to be signs of witchcraft (Betty Parris, age 9, and her cousin Abigail Williams, age 11) IOTL never did so--or did so to a lesser extent, either of which pretty much obviates the accusations and subsequent trials.
What longer-term effects does the lack of the witch trials have on US history? Recall, by the way, that these trials were contemporary with the career pinnacles of Isaac Newton and Gottfried Liebnitz, and that witchcraft trials in all but the fringes of Europe had faded away by then, making the events in Salem decidedly anachronistic.