1. When and why were reservations founded? 

Reservations were founded on 18th century and were founded because the goverment want to preserve the culture in those places.

2.  How different are they from national US land?

The reservations are the four percent of the land of the US. To this place only can enter a white person if some of the native person want it.

3. Why do so many Native Americans live outside the reservations? 

Native Americans live outside the reservations because they don't want to change tradition and culture and they wnat to preserve it.

4.Do reservations help preserve tradition and culture?

Yes, because in all aspects all the tradition and culture are save in this place and not one can change it and by this form this are preserve in the time.