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In page Public holiday:

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Public holidays constitute an important part of nation building and become important symbols of the nation. They can build and legitimise the nation and are intended to foster national unity, social cohesion and popular identification. They provide national governments with annual opportunities to reinforce the status of the nation.[citation needed] Sabine Marschall argues that public holidays can be regarded as sites of memory, which preserve particular representations of historical events and particular national or public heroes.[2]