Answer:
Revolution and war in the 1790s created a strong sense of national unity in France. This feeling inspired French armies to succeed as they sought to spread the ideals of their revolution. In the years following the French Revolution, nationalism led to upheaval in Europe and elsewhere. In 19th Century, Nationalism played very significant part in the progress of Europe. Because of common national-identity, various small states were united and transformed into a Country, such as Germany and Italy. Progress and Development of the concept of modern nation state became easier by French Revolution.
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