Yes but also these vast Midwest grassland areas were flat. Flat land is much better for mechanized agriculture such as this >>>
Farm workers with horse-drawn combine harvesting wheat, Almira, Washington, August 1911
Farms in hilly areas are always smaller than farms in flat areas. Europe had small farms that stayed in families for centuries while the Europeans who streamed into the US MidWest could claim large tracts of land after wresting it from the Indians.