The American Old West or Wild West comprises the history, geography, peoples, lore, and cultural expression of life in the Western United States, most often referring to the period of the latter half of the 19th century, between the American Civil War and the end of the century. More encompassing and more accurate, however, is the inclusion of the entire 19th century.Through treaties with foreign nations and native peoples, political compromise, technological innovation, military conquest, establishment of law and order, and the great migrations of foreigners, the United States expanded from coast to coast.In securing and managing the West, the federal government greatly expanded its powers, as the nation grew from an agrarian society to an industrialized nation.