North America’s sea of grass once covered an area from Illinois to Wyoming and Canada to Texas, touching or encompassing around seventeen states. This “Great Plains” grassland ecosystem is most simply divided into three ecotones: tallgrass, mixed grass, and shortgrass. Within these ecotones there are many ecosites, such as the Sandhills of Nebraska or the Flint Hills of Kansas. These ecosites occur on gradients of longitude, precipitation, and soil.