I really wish I could help you but try to use google and look up the answer key online
Building techniques improved, iron became more common, and hydraulics were used to dig riverbeds deeper. So less floods happened that destroyed farms and endangered lives.
I believe that the answer to the question provided above is that <span> establishing smaller ethnic communities within larger communities gives more chance for people to know each other more but this might lead to the </span>conflict between groups.
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There were several important factors that contributed to the ability of europeans to conquer the aztecs and inca, but the most important three were that the Europeans brought guns, germs, and steel weapons.
