When the other states were willing to accept Wilhelm of Prussia as Emperor Wilhelm of the German Empire at their leader, unification became possible. The reunification had actually been developing over a long period of time. It realized the lesser German solution by excluding Austria.
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Political parties tend to unify in various ways. This is seen when they nominate one person to represent the party in an election and they campaign for the person fully.
A nation state gave early people's far more security and a better understanding of their common language and history. These things unify a nation state and give the people within a reason to identify with said state.
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The Madison's plan did advocate for a very strong central government that would unify the people.