Which idea led to the unification of Italy and Germany?

The crimean war, a conflict which destroyed the Concerts of Europe led to this unification. The Crimean War put two of Europe's largest powers and allies Austria and Russia as enemies.

Explanation:

you didn't give any answers to choose from so i can't with this but, i do know something that the mexican government would be worried about and that is the wall that donald trump is currently trying to get up.

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.