Who were the only people that were not allowed to be a citizen in the roman empire

The answer would be the Europeans.

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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in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate