where was halloween invented

Halloween originated from the ancient Celtic festival of Samhain, which was observed in the British Isles (especially Ireland, Scotland, and parts of England) around the harvest season and the start of winter. Over time, Samhain blended with Christian observances, notably All Saints’ Day (All Hallows’ Day) on November 1, created by the Church, and the evening before became All Hallows’ Eve, later known as Halloween. Irish and Scottish immigrants later brought many of these customs to North America, where pumpkins became the carving staple and many traditions evolved into the modern Halloween celebration. [Cited context: origins in Samhain; connection to All Saints’ Day; transmission to North America via Irish/Scottish immigrants]