Answer:
European settlers and Americans transformed the Great Plains from natural grassland to fields of corn.
Explanation:
The Great Plains are a vast portion of prairies with just a few trees. When worked correctly, it can be transformed into great fields for agriculture.
http://faculty.chemeketa.edu/afrank1/topo_maps/scale.htm use this website and i think this should fully explain it
Answer:
Because of the influence of colonial rule. There is also another reason: to unify all languages.