The Halloween started with the Celtic festival of the Samhain, a festival where people wear costumes to chase evil spirits, and also light bonfires. Pope Gregory 3, in the eighth century, decided to mark November 1 as a day to honor the Saints. People started to buy into the traditions of the Celtic (Samhain). Around the middle of the nineteenth century, there used to be annual autumn festivities, which was becoming more popular, but still, Halloween was not really recognized.
Towards the end of this year, there came more immigrants into the United States, of which there was a large immigrant from the Irish nation. Their arrival then spurred the national recognition of the Halloween celebration. In the long run, Halloween was publicized to be a public holiday at the end of the 18th century. Coming down to this present day, Halloween happens to be the second most widely celebrated holiday in the United States.