Task about reservations

When and why were reservations founded? Some friends told me that reservations were founded on the 18th century, and they were founded because they want to preservate the native amiricans traditions and culture. How different are they from national US land? The difference between national US land and the reservations is that the national US land protect special areas of the EEUU, like the grand canyon Why do so many Native Americans live outside the reservations? Because the conditions of life in the reservations are not very good, so they prefer to live outside them Do reservations help preserve tradition and culture? Yes, because is like a animal reservation and in an animal reservation you can preservate a specie, and is the same here, but preservating the tradition and culture from the people in the reservation.