Step-by-step explanation:
It is of interest to remember that as part of the Homestead Act which was enacted during the civil war, had granted lands to residents at the time. This led to increased settlement decades after the civil war.
Also, as a result of the increased construction of railroads, there was increased settlement the West. Such expansion has been attributed to the resettlement of many Native Americans from their lands; ultimately leading vanishing of the American frontier.