Some advantages were that the states were able to expand into what once was Native American territory. Disadvantages were the obvious moral issues in decreeing that you are not allowed to live in a place where your background has been for hundreds and thousands of years.
I think the correct answer is D.
They are all associated with the “civil rights”
The Great Plains include theLlano Estacado, the Panhandle,Edwards Plateau, Toyah Basin, and the Llano Uplift. It is bordered on the east by the CaprockEscarpment in the panhandle and by the Balcones Fault to the southeast. Cities in this region include Midland and Odessa, Lubbock, and Amarillo.