Context: The term "Great Plains", for the region west of about the 96th or 98th meridian and east of the Rocky Mountains, was not generally used before the early 20th century. Nevin Fenneman's 1916 study, Physiographic Subdivision of the United States, brought the term Great Plains into more widespread usage. Before that the region was almost invariably called the High Plains, in contrast to the lower Prairie Plains of the Midwestern states. Today the term "High Plains" is used for a subregion of the Great Plains.

Question: what is the name of the region east of the Rocky Mountains?
Answer: "Great Plains

Question: who brought the term great plains into widespread usage?
Answer: Nevin Fenneman's

Question: what year was Nevin Fenneman's study?
Answer: 1916

Question: what was theregion called before "the great plans"? 
Answer: the High Plains

Question: What region lies east of the 96th or 98th meridian?
Answer: Unanswerable

Question: Who came up with the term High Plains?
Answer: Unanswerable

Question: What area of states lie in the Great Plains?
Answer: Unanswerable

Question: In what century did people start calling what we call the Great Plains the High Plains?
Answer: Unanswerable