Final answer:
The Congress of Vienna reorganized Europe after Napoleon's downfall to establish a balance of power and prevent French aggression, impacting nationalism.
Explanation:
The Congress of Vienna took place in 1814-1815 after Napoleon's downfall to reorganize Europe. It aimed to establish a balance of power, prevent future French aggression, and redraw the map of Europe without severe penalties on France. The changes made by the Congress of Vienna had significant implications for nationalism, as new boundaries often disregarded the desires of various ethnic groups, leading to discontent and fostering nationalist sentiments.
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