A unitary state is a state governed as a single power in which the central government is ultimately supreme and any administrative divisions (sub-national units) exercise only the powers that the central government chooses to delegate. The majority of states in the world have a unitary system of government.
The germans and americans with german ancestry, i think
They fought together because Germany had betrayed Russia or the USSR during WW2. So Russia decided to fight with America against Germany.
Answer:
it's is beceuse it studies behaviour of people and help people to be socialize
