This document provides an overview of Chapter 18 which discusses the development of the American South and Trans-Mississippi West between 1870-1914. It summarizes that both regions came to primarily supply raw materials and foodstuffs while consuming finished goods, integrating them into the national economy. The chapter then highlights and provides brief summaries of the key topics that will be covered, including the Southern burden of agriculture, rise of industry, life in the New South, western frontiers and environments, the war for the west against Native Americans, booms and busts in mining and cattle, and the final settlement of the plains.