Why did the American Frontier Close?

Over a period of about three fifty years, from when the white explorers first crossed over to America in search of a fresh start away from taxes, crime and persecution, the Native Indians Frontier had gradually been drawing to an end. The explorers constantly broke agreements with the Natives about their territories and many skirmishes left countless dead, most of which were Indians. Eventually in 1890 the Director of US census bureau finally announced that the …

…their culture. The whites had more firepower and more men so easily won battles. The new settlers were driven by their belief of Manifest Destiny and the Indians were tricked. The white's made treaties and agreements, which later they broke, with no consequence because of their superiority in arms and numbers. The Native Americans were finally rounded up into reservations, where many, if not all died out. Almost the complete extinction of an entire culture.