Why does agriculture thrive in the Great Plains of North America?

The Great Plains is the most productive dryland wheat area in the world, and pivotal to world grain supplies (Riebsame 1990). Great Plains production accounts for 51% of the nation's wheat, 40% of its sorghum, 36% of its barley, 22% of its cotton, 14% of its oats, and 13% of its corn.

Explanation:

lack of interest from state and local governments.

if interdependence implies a two-way dependence, and if each partner is equally dependent on the other for success, then there is an equal commitment to the making the partnership successful. the advantage is sustainability of the relationship, the disadvantage is that decisions are "democratic" and therefore may take longer to reach and more likely to be a compromise (which is not always the best solution). as the interdependence moves away from equality, the decisions become more influenced by the more independent partner. in the extreme the relationship becomes more dictatorial and more like "master-slave". generally the relationship has less commitment in both directions and is more likely to be temporary.

if one generalizes (and one shouldn't), equity partnerships, which is probably what is implied by interdependence, can be slow to progress or change but durable. the extreme alternative, independent-dependent partnerships tend to be efficient but more fragile.

hope this but you will have to site your own evidence. : )