Main island of hawaii for As steamboats, ocean-shipping, and canals linked these regions in the decades before the AMERICAN CIVIL WAR, each progressively specialized in its own comparative advantage. The South exported sugar, rice, tobacco, and increasingly cotton; the North became a financial, commercial and manufacturing center; and the West dedicated its resources to food and animal production. Trade allowed them to complement each other, spurring economic growth. The book’s central contribution showed how economic theory and measurement could explain the broader contours of history. During this period, North became a veritable apostle for the new cliometric approach, as exemplified by his brief textbook, Growth and Welfare in the American Past (1966), which challenged many conventional views on important topics in American economic history, using basic economic theory and quantitative evidence. In the mid-1960s, North turned his attention to European economic history, and became convinced that standard economic theory was incapable of explaining longer-term economic change. His subsequent research sought to go beyond economic growth’s proximate causes (such as technological change and investment) to its ultimate causes. Main island of hawaii 2016.