Why were early people in North America able to build complex cultures?
a. They had learned how to farm.
b. They had learned how to start fires.
C. They had advanced weapons.
d. They had a written language.

A. They had learned how to farm

Explanation:

I hope it good for you

what are local authorities doing to fix the problem

explanation: what are local authorities doing to fix the problem

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )