Decline of Civilizations - AP World History?

Can you think of instances in which one pre-Industrial civilization was a major factor in the collapse of another?!
PLEASE HELP AND EXPLAIN!!
please answer anything you can!
1. Can you think of instances in which one preindustrial civilization was a mjor factor in the collapse of another?
2. Why do you think such an occurance was so rare?
3. Discuss the advantages that the Native Americans' isolation from civilizations in Europe, Africa, and Asia gave the European intruders in the 16th century.
4.What kinds of advantages did the scientific and industrial revolutions give the Europeans over all other civilized peoples from the 18th century onward?
5. IS THE WEST LOSING THEIR ADVANTAGES TODAY!?

nklmkmklmok