They leave because Jim was going to be sold for $800 to slavery down in Orleans, and they both decided to escape.
Huck and Jim leave Jackson Island because they fear being caught by people searching for Jim, who is a runaway slave. They believe it's safer to continue their journey down the river on the raft in order to reach freedom.
so they wouldnt get caught
The lady in town tells Huck about the tragic murder of the Grangerford family members by the Shepherdsons. She warns Huck to stay away from the feud between the two families.
Jim and Huck stayed on Jackson's Island, an uninhabited island on the Mississippi River, while they were hiding. They used it as a temporary refuge to avoid being caught.
Because men are coming to search Jackson Island
Huck learns from Mrs. Loftus that there is a reward for Jim's capture. Authorities are planning to search Jackson's Island immediately.
Huck meets Jim, Miss Watson's slave, on Jackson's Island. Jim has run away from his owner and is planning to escape to freedom. Huck and Jim ultimately team up and travel together down the river on a raft.
Huck picks up Jim, a runaway slave, while they are both trying to escape their respective situations. Huck finds Jim hiding on Jackson's Island while he is trying to avoid his abusive father and decides to help him in his quest for freedom.
Jim is initially startled when he sees Huck on the island, as he believes that he has seen a ghost. However, he quickly realizes that Huck is alive and is relieved to be reunited with him. Jim is happy to see Huck safe and well.
The young boy warns Huck that people are looking for Jim because he has run away. He tells Huck that Jim is suspected of murdering Huck.
Huck escapes to Jackson's Island, located on the Mississippi River, after leaving his abusive father in Mark Twain's book "The Adventures of Huckleberry Finn." Here, he finds refuge and encounters Jim, a runaway slave seeking freedom.
Huck led the men in the opposite direction by telling them that his father was on the raft with smallpox. This caused them to leave quickly without searching the area where Jim was hidden.
They helped him escape, but Tom only did it for the thrill of the adventure. The widow had died two months earlier and freed Jim in her will. Jim was already a free man, Tom just didn't say anything because he wanted the fun of planning Jim's escape.
He told Huck that Jim had been sold as a runaway slave!!!