Which of the following played an important role in the unification of both italy and germany

The ideologies that played the biggest role in the unity of both Germany and Italy were nationalism and liberalism. However, conservatism also played an important role in the unification of Germany.

Explanation:

the completion of the erie canal spurred the first great westward movement of american settlers, gave access to the rich land and resources west of the appalachians and made new york the preeminent commercial city in the united states.

c is the correct answer for this question.