Also a Civilization could fall for any reason from killing the king to starting war inside
Explanation:
From the collapse of ancient Rome to the fall of the Mayan empire, evidence from archaeology suggests that five factors have almost invariably been involved in the loss of civilizations: uncontrollable population movements; new epidemic diseases; failing states leading to increased warfare; collapse of trade routes
A civilization may fall if an attack, shortage of food, or war happens. A disagreement in the government or disease may also make the civilization fall too.
Explanation: usually when you see a group of men standing around each other, you would want to stay away from them because maybe they might be selling drugs or who knows what and you wouldnt want to walk right through them because they'll probably get mad you.