How did rome gain controle of Italy?

Answer 1

Rome took advantage of the Etruscans during this time. The Etruscan people had been weakened by the invasion. This gave the Romans the opportunity to eventually expand and take over their territory. Within 100 years, Rome controlled all of Etruria. During that time, it also conquered central Italy and much of northern Italy. In addition, Rome sent its forces south, where Greek settlers had founded a number of city-states. By 275 BCE, Rome had defeated those Greek city-states as well. Rome now ruled all of Italy. ( this answer was possible by Connexus, A school for virtual children, thanks to them)

Answer 2

Rome gained control of Italy by conquests, treaties, alliances and the granting of Roman citizenship to their allies.