The Question and Answer section for All the Pretty Horses is a great resource to ask questions, find answers, and discuss the novel.
I'm sorry, this is a short-answer Literature forum designed for text specific questions. We are unable to assist students with other subjects.
I'm not sure what you are asking here.
I think that MCCarthy is referring to the end of rural ranch life the way Grady's grandfather, and others during the era (1860's to mid 1900's) had lived.