Final answer:
The principal difference between an autocracy and an oligarchy is the number of people in charge.
Step-by-step explanation:
The principal difference between an autocracy and an oligarchy is the number of people in charge. In an autocracy, a single individual holds the power and makes decisions for the entire country. Examples of autocracies include absolute monarchies and dictatorships. On the other hand, an oligarchy is a form of government where a small group of individuals, usually from a privileged class, has control over the country. Examples of oligarchies include aristocracies and plutocracies.
Learn more about Autocracy and Oligarchy