What was needed before cities and complex civilizations could develop in the americas? . 1)plenty of land. 2)a surplus of food. 3)a large population. 4)access to precious metals.

mesopotamian code of hammurabi

and i think its 1860 b.c. you mean lol

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)