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A dictator.
Dictatorship
A country whose ruler has unlimited power is called an autocracy.
An absolute ruler is a ruler that has unlimited power over their country.
He is a dictator and has all the power.
dictator
If a country does not have a ruler, then it is simply ruled in a democracy or the people are the power.
Hitler is a dictator- a single ruler with absolute power on the country over which he rules.
A ruler should do whatever is necessary to maintain power
A ruler that has unlimited power and authority over his or her power is an absolute monarch.
A ruler who has absolute power can be called a dictator or despot.
Dictator: a ruler with total power over a country, typically one who has obtained power by force. That's what Adolf Hitler was.