John Deere's invention of the steel-tipped plow in 1837 improved agriculture by allowing farmers to cut through hard-packed prairie sod in the west which the population in the West/Midwest. The Underground Railroad was a network of “safe houses" owned by people who slavery who helped slaves escape to the North. The Transcontinental linked the eastern and western U.S. with the completion of twO competing railroad companies on May 10, 1869, by driving in the final "Golden Spike" at Promontory Point, Utah.

John Deere's invention of the steel-tipped plow in 1837 improved agriculture by allowing farmers to cut through hard-packed prairie sod in the west which the population in the West/Midwest. The Underground Railroad was a network of “safe houses" owned by people who slavery who helped slaves escape to the North. The Transcontinental linked the eastern and western U.S. with the completion of twO competing railroad companies on May 10, 1869, by driving in the final "Golden Spike" at Promontory Point, Utah.