the answer is.. The age of exploration beginning in 1400s led to long term population increase
I do not think it is a complete sentence because, what's behind the door?
The question is asking to state or describe how both groups used land, and how their ways of life conflicted, and base on my research, I think the best way to explain it is that they have conflict on their interest of the resources found on each land of the Great Plains. I hope this would help