In the three decades following 1870, more land was settled than in all the previous history of the country. Americans by the hundreds of thousands packed up and moved west, goaded if not by the hope of striking gold, then by the promise of owning land to farm or ranch. The agrarian West shared with the mining West a persistent restlessness, an equally pervasive addiction to speculation, and a penchant for exploiting natural resources and labor.

Two factors stimulated the land rush in the trans-Mississippi West. The Homestead Act of 1862 promised 160 acres free to any citizen or prospective citizen, male or female, who settled on the land for five years. Even more important, transcontinental railroads opened up new areas and actively recruited settlers. After the completion of the first transcontinental railroad in 1869, homesteaders abandoned the covered wagon, and by the 1880s rampant railroad overbuilding meant that settlers could choose from four competing rail lines and make the trip west in a matter of days.

Although the country was rich in land and resources, not all who wanted to own land achieved their goal. During the transition from the family farm to large commercial farming, small farms and ranches gave way to vast spreads worked by migrant labor or paid farmworkers and cowhands. Just as industry corporatized and consolidated in the East, the period from 1870 to 1900 witnessed corporate consolidation in mining, ranching, and agriculture.