Halloween is a celebration observed in many countries on October 31, the eve of the Western Christian feast of All Hallows Day. The origins of Halloween can be traced back to the ancient Celtic festival of Samhain, which was celebrated in Ireland and Scotland for centuries. However, it was not until after mass Irish and Scottish immigration in the 19th century that Halloween became a major holiday in America. Most American Halloween traditions were inherited from the Irish and Scots, though it was gradually assimilated into mainstream society and was celebrated coast to coast by people of all social, racial, and religious backgrounds by the early 20th century.

Therefore, it is incorrect to say that a specific country started Halloween. The celebration has evolved over time and has been influenced by various cultures and traditions. While the ancient Celtic festival of Samhain is considered the origin of Halloween, the holiday as we know it today has been shaped by the customs of different countries and regions.