1) It was because it would destroy the balance of power.
2) It was to keep riots and more revolutions from starting again
3) By defeating Austria so it could unite with Sardinia
4) It was unified by France when a peace treaty was given to them in order to stop the north german confederation.
5) It ended with prussia along with russia winning.
6) Austria didnt want to be a seperate state, instead they liked how they were merged with Hungary.