The common people who were able to obtain power in the roman republic

Romans suffered a major setback when the Celts—or Gauls, as the Romans called them—invaded the Italian peninsula from the north, destroyed a Roman army, and sacked the city of Rome. After the Celts withdrew, the Romans were able to rebuild their city and recoup their losses.

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the answer is aggresion hope this and mark me as brainiest and add me as friend