The two types of economies found among different Native American groups were pueblo farming and bison. The first consisted in different farming techniques to preserve water, this techniques were developed basically answering to the dry climate conditions. The latest, was the hunting of bison as an economic system in which every part of the animal was well used and trade: fur, mear, hooves, horns, etc. As a result of the hunting bison number was reduce almost to extinction at that time.