What was the effect of attacks on farms and trade routes?

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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the name of the theory is landmass theory.

the anwer to

this question is false the spnaish had more than enough reinforcments and soldiders to defeat the azatecs becuase the azatecs did not have the advanced technolgy the spanish did