Question

What geographic conditions posed the greatest challenge for early civilizations?

(This is about civilizations like the Olmec the Aztec the Incas and Indian tribes in north america)
Example 1:

Example 2:

Answer 1

The civilizations you mention are not that early compared to most. But any civilization needs to have a secure food supply. So a geography that includes an area for good farming would be a necessity. Also, making sure the river you choose to live by is not going to dry up or freeze over every year. I hope that this is the answer that you were looking for and it has helped you.