How is oligarchy different from direct democracy

Oligarchy would be the "the rule of the few" such as a nation led by Oil tycoons, or a nation led by nobles such as some medieval nations. A direct democracy would mean that citizens are directly involved in the decisions of the government. A true direct democracy would mean that there are essentially no elected officials, as everything is voted on by everyone.

bibliography and citations to credit the sources hope this you if not my deepest of apologize ^w^

these civilizations were located around fertile rivers, where they could produce an abundance of crops