Nebraska.
Nebraska is a state in the midwest of America and at the time this book was set was a place that was not majorly developed. Westward expansion in America was popularised throughout the nineteenth century, the US government even implemented the Homestead Act in 1862 which rewarded anyone willing to move west and cultivate the land they were given in exchange. This was in the midst of the American Civil War which ran from 1861 to 1865. Hence, people like Cather’s characters were moving westward like many Americans, particularly those of low socio-economic status because it was an attractive proposition to help achieve the ‘American Dream’.