How did the wave of economic …

Economic nationalism strengthened the wider nationalist sentiment.

(i) In the economic sphere, liberalisation stood for the freedom of markets and the abolition of state imposed restrictions on the movement of goods and capital.
(ii) There was a strong demand of the emerging middle classes. For example, the German-speaking regions in the first half of the 19th century.
(iii) Napoleon's administrative measures had created out of small principalities a confederation of 39 states. Each of these possessed its own currency, weights, and measures.
(iv) Such conditions were viewed as obstacles to economic exchange and growth by the new commercial classes who argued for the creation of a unified economic territory allowing the unhindered movement of goods, people and capital.
(v) The union abolished tariff barriers and reduced the number of currencies from over thirty to two.
(vi) The creation of a network of railways further stimulated mobility, harnessing economic interest to national unification.