All late tasks 1

1.- In 18th century and because the government wanted to keep the culture
2.- The reservations are in a way ownership of the natives, because only them can enter an the not natives only can enter with the permission of them
3.- Because they want to preserve their culture and stay without changes of the not natives
4.- Yes, because if the not natives don't interfere in the reservations, they can preserve their culture and their traditions without being interfered by the not natives