?? is a political system headed by a dictator that calls for extreme nationalism and often racism with no tolerance of opposition ​

dictatorships

Explanation:

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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brainliest?

b europeans take corn to africa. corn becomes an important crop there.