The document provides background information on the setting and time period of the book The Adventures of Tom Sawyer by Mark Twain. It describes how the story takes place along the Mississippi River in the late 1800s in the fictional town of St. Petersburg, which draws from the real town of Hannibal. Life in this era was still old-fashioned and impoverished in some ways, as slavery still existed. The document also provides details about the main character Tom Sawyer, describing him as a mischievous boy who enjoys adventures and tricks but dislikes schoolwork, and introduces other main characters like Huck Finn and Joe Harper.