* Kansas: The Ingalls family first settles in Kansas in 1861, but they are forced to move due to the lack of rainfall and the threat of Native American raids.
* Minnesota: The Ingalls family moves to Plum Creek, Minnesota, in 1870, and most of the stories take place in this location.
* Dakota Territory: The Ingalls family moves to Walnut Grove, Dakota Territory (now Minnesota), in 1879, and they continue to live there until the end of the series.
The books follow the Ingalls family's journey through the westward expansion, as they encounter both the beauty and challenges of pioneer life. The specific locations and time periods are often mentioned within the books, giving readers a detailed glimpse into the historical context of the stories.