<P> Irony also becomes a part of this book . Ma's prejudice about American Indians, and Laura's childish observations of them, are contrasted with Pa's more egalitarian view of them, and these views collectively are shown side by side with the objective portrayal of the Osage tribe that lives on and owns that land . </P> <P> At the end of this book, the family is told that the land must be vacated by settlers as it is not legally open to settlement yet, and in 1870 Pa elects to leave the land and move before the Army forcibly requires him to abandon the land . </P> <P> On the Banks of Plum Creek, published in 1937 and fourth in the series, follows the Ingalls family as they move from Pepin, Wisconsin to Kansas to an area near Walnut Grove, Minnesota, and settle in a dugout "on the banks of Plum Creek (Redwood County, Minnesota)". </P> <P> Pa trades his horses Pet and Patty to the property owner (a man named Hanson) for the land and crops, but later gets two new horses as Christmas presents for the family, which Laura and her sister Mary name "Sam" and "David". Pa soon builds a new, above - ground, wooden house for the family . During this story, Laura and Mary go to school for the first time in town where they meet their teacher, Miss Eva Beadle . They also meet Nellie Oleson, who makes fun of Laura and Mary for being "country girls ." Laura plays with her bulldog Jack when she is home, and she and Mary are invited to a party at the Olesons' home . Laura and Mary invite all the girls (including Nellie) to a party at their house to reciprocate . The family soon goes through hard times when a plague of Rocky Mountain Locust decimates their crops . The book ends with Pa returning safely to the house after being unaccounted for during a severe four - day blizzard . </P>

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