Why is the pumpkin the symbol of Halloween?

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Due to the adaptation of the legend of Jack o’lantern to North American folklore. In Ireland, candles were lit inside turnips to ward off evil spirits on the Celtic feast of Samhain, which celebrated the end of summer. The custom would have been taken by immigrants to the US and incorporated into All Hallows Even (Eve of All Saints’ Day), giving rise to Halloween. Legend has it that Jack, a man who liked to drink, crossed paths with the devil in his drunkenness and tricked the bad thing several times so as not to be taken to hell. Until the day he died from too much drinking. He was denied entry into heaven as well as hell, as he had humiliated the devil in life. Since then, Jack has wandered around with candles inside turnips to light up his lost soul. When the Irish arrived in America, they would have realized that pumpkins were more abundant there and started using them in place of turnips.