Prince metternich of austria found the idea of italian unification impossible because

National interests

Explanation:

Prince Metternich of Austria, a firm believer of balance of power among the great European powers, opposed Italian unification because Austria controlled large areas of northern Italy where industry and trade flourished. As it happens, North Italy is the economic motor of the country. Which makes it interesting to investigate why this flourishing part of Italy was hit so hard by the corona-virus.