Explain napoleons role in spreading nationalism conributed at nationalist movements

From 1803-1815, Napoleon and his armies traversed Europe to try to unite the continent under French control. When Napoleon was crossing the continent, he unknowingly spread his ideal of nationalism, which was the idea of national pride and unity. There were three steps to this spread: first, Napoleon's conquest of Europe spread nationalism throughout the continent; second, the Congress of Vienna repressed nationalism for almost a century while oppressing countries rights, which had the paradoxical effect of spreading Nationalism even further; third, the Revolutions of 1848 used Nationalism to change the leadership and political landscape in countries like Austria, France, Prussia, and Spain. Thus, Nationalism changed Europe as a whole.