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In page Romantic nationalism:

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Historically in Europe, the watershed year for romantic nationalism was 1848,[citation needed] when a revolutionary wave spread across the continent; numerous nationalistic revolutions occurred in various fragmented regions (such as Italy) or multinational states (such as the Austrian Empire). While initially the revolutions fell to reactionary forces and the old order was quickly re-established, the many revolutions would mark the first step towards liberalisation and the formation of modern nation states across much of Europe.