Why was Peru a difficult place for a civilization to develop?

I think its because it does not have that great resources so not many people will want to go there.

Explanation:

Because of its rough terrain

Expansion diffusion

The spread of an idea through a population in a way that the number of those influenced becomes continuously larger. Includes contagious, hierarchical, and stimulus diffusion.

Contagious diffusion

Distance-controlled spreading of an idea through a local population by contact from person to person.

Hierarchical diffusion

An idea spreads by passing first among the most connected individuals, then spreading to other individuals

Stimulus diffusion

A form of diffusion in which a cultural adaptation is created as a result of the introduction of a cultural trait from another place. In other words, it is the spreading of an underlying principle of an idea when the idea as a whole cannot spread to a particular culture.

Relocation diffusion

A form of diffusion where the ideas being diffused are transmitted by their carriers as they relocate to new areas