The Pentateuch as Torah

Since antiquity, the five books of Moses have served as a sacred constitution, foundational for both Jews and Samaritans. However long the process of accepting the Pentateuch as authoritative tōr ("instruction") took, this was by all accounts a monumental achievement in the history of these peoples and indeed an important moment in the history of the ancient world. In the long development of Western societies, the Pentateuch has served as a major influence on the development of law, political philosophy, and social thought. The question is: how, where, and why did this process of acceptance occur, when did it occur, and how long did it take?