Ancient Rome is presented as a model civilization due to its powerful military and government which helped it last for a long period of time. Additionally, Rome had a strong economy which provided plenty of jobs. While a strong military is necessary for defense, it can harm a civilization if used for aggression against other civilizations. Maintaining good relations and alliances with nearby civilizations helps support a stable economy through trade and reduces the chances of war. A good government that citizens support, like a democracy, is also important for a civilization's long-term success according to lessons from history.