Think about the text, "History of Christmas." Look at the excerpt below,consider its structure, and answer the question.
Many attribute the change to Queen Victoria, and it was her marriage to the German-born Prince Albert that introduced some of the most prominent aspects of Christmas. In 1848 the Illustrated London News published a drawing of the royal family celebrating around a decorated Christmas tree, a tradition that was reminiscent of Prince Albert's childhood in Germany. Soon every home in Britain had a tree bedecked with candles, sweets, fruit, homemade decorations and small gifts.
What is the author’s purpose in writing “History of Christmas?”