Rome's success in conquering Italy was due to several key factors. First, Rome had a strong military tradition and was able to field large, well-trained armies. Second, Rome was able to form alliances with other Italian cities, which allowed it to gain support and resources. Third, Rome was able to incorporate conquered peoples into its society, which helped to stabilize its conquests. Finally, Rome had a strong system of government, which allowed it to effectively govern its territories. Overall, Rome's success in conquering Italy was due to a combination of military strength, alliances, cultural assimilation, and effective governance.