"O Pioneers!" is considered to be one of Willa Cather's greatest works. It is the story of Alexandra Bergson, a young girl who arrives in the prairie frontier of Hanover, Nebraska and grows up to build a prosperous farm. "O Pioneers!" is a classic portrayal of the struggles of immigrants in the great plains of America. It is a story of success in the face of tragedy and the growth of a young woman along the way.