The President is both the head of state and the head of government (i.e. United States, most countries in the Western Hemisphere).
This is as opposed to a parliamentary system where the head of state is a President or monarch and the head of government is the Prime Minister (Britain, ex-European colonies).
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It means that the government makes all of the rules and it is controlled by a president and another leader in power.
unitary
It's Unitary. Plain and simple. This is most easily seen in the Russian State Duma. Russia is actually considered a Federal Republic with numerous subdivisions and autonomous regions. However, in terms of actual administration, Russia seems much closer to a Unitary State.
When all the power is vested in the centrel government
Unitary.
Unitary