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).
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.
Unitary.
When all the power is vested in the centrel government
Unitary
It is a unitary
It's a Unitary presidential republic.
It is a Unitary presidential republic.
Constitutional Republic (Unitary)
A Unitary Parliamentary Republic
The official name of Germany (in English) is the Federal Republic of Germany. There are 16 states.
It is a Unitary presidential republic
Austria is a federal republic.
It is a federal presidential representative republic.
Vietnam is a unitary socialist republic, a single party state which is communist in nature.
Libya government is a Unitary Parliamentary Republic
The Egyptian government is a Unitary semi-presidential republic.