Maya because of the time the tribes, and revolutionizing Into the Aztecs
1,2,4
Are the correct answers
The first civilizations didnt use metal very often, but when they did it was usually for farming tools.
I assume you mean what challenges after they gained independence. They had many internal conflicts. This included fighting about religion. There were also natural disasters. There was the problem of transitioning directly from a dictatorship to a democracy.
