Answer And Explanation:
Autocracy - An autocracy is a government system that has only one person in power, said person has absolute power over every citizen, land, and function. Hitler is a good example
Oligarchy - An oligarchy is a government system that, unlike an autocracy, has a couple of people in power. These people are accepted based on how they can control wealth, nobility, and political/military control.
Democracy - Democracy is a system of government where a few people are elected to represent the state or country, unlike an oligarchy , however, the people are selected by the citizens