Westward expansion between 1801-1861 encouraged exploration and vast territorial growth in the US, leading to new economic opportunities. The development of industries like mining, ranching, farming and logging expanded across the Midwest and West. In the late 1800s, the railroad system and new technologies like the telegraph connected more areas and accelerated the movement of people and goods. However, westward expansion also resulted in conflict as Native American land was increasingly taken and destroyed, with many tribes being killed or forced to assimilate to white culture. By the early 1900s, the contiguous US stretched across North America following these patterns of exploration, settlement, development and industry spurred by westward migration.