Warfare between white americans and native americans of the great plains during the 1840s was caused by movement of wagon trains, because whites natural resources such as buffalo and trees.

the results of roman expansion produced social conflict and civil war. julius caesar gained power and became a dictator but was then assassinated. the reign of augustus began a long period of imperial rule and peace in the roman empire. rome faced the problems of how to maintain peace, law, and order.

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