Appalachia: Settlement and Coal With the coming of the industrial revolution, coal became the fuel that fired the furnaces of the nation, transforming the Appalachian region socially and economically. Unfortunately mountain people didn't realize the implications of their mineral wealth. Many sold their land and mineral rights for pennies an acre to outlanders. Appalachians became laborers rather than entrepreneurs. Coal became a major industry which was extremely sensitive to outside fluctuations in the economy, leading to boom and bust cycles. The industry was controlled by interests outside the region, so that little of the profit remained or was reinvested. When oil flooded the marketplace in the 1950s it displaced coal as the nation's primary source of energy. Coal company towns that met housing and other needs of miners and their families, freezing out the development of more diversified economies, abandoned these communities, leaving the people to fend for themselves. This might not have been so devastating except that the coal bust was accompanied by the region's lack of diversification, and failure to keep pace with changing times and new technologies. The period from 1940 to 1970 saw the Appalachian region lose more than 3 million people to outmigration. By 1960, it looked as if oil had sounded the death knell for coal, and in doing so, had doomed Appalachia to an economic depression from which it might not ever recover. During the 1980s outmigration from rural areas accelerated again, as the Ohio Valley was devastated by the collapse of the steel industry.