Answer:
The geographic factors made them secluded from other cultures and preserve the originality of their culture
Step-by-step explanation:
Indigenous culture were originated from a region that was considered to be very difficult to survive in. (typically they can be found in forest with high elevation in American continent). This harsh environment require them to develop their current culture that fir the environment, so they focus on agriculture, utilize irrigation technique specific for high elevation, and created several groups with their own leaders to organize the other members.
The fact that their environment was very harsh also made very few other cultures want to visit their territory. This made this culture became secluded until the European came to their territory seeking for resources during the colonization era.