What was one impact of westward expansion in the United States during the mid-nineteenth century?

Like Thomas Jefferson, many of these pioneers associated westward migration, land ownership and farming with freedom. In Europe, large numbers of factory workers formed a dependent and seemingly permanent working class; by contrast, in the United States, the western frontier offered the possibility of independence and upward mobility for all. In 1843, one thousand pioneers took to the Oregon Trail as part of the "Great Emigration."

Answer:in the late 19th century the west developed into a modern agriculture transportation by rail