Background information Contents I。 Author IL。 The American West a. General Introduction b the Rocky Mountain States c the pacific coast states d. Frontier Spirit and Expansion Towards the West e Violence in the 19th Century W BTL E BACW B T L E Lesson 14 - After Twenty Years I. Author II. The American West a. General Introduction b. the Rocky Mountain States c. the Pacific Coast States d. Frontier Spirit and Expansion Towards the West e. Violence in the 19th Century Background information