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Nationalism played a significant role in shaping the political landscape of Europe during the era of Napoleon and beyond. The Napoleonic Wars helped to spread nationalist ideas throughout Europe as people began to see themselves as part of a larger national community. This led to the rise of new nation states like Germany and Italy, as people in these regions began to demand greater political autonomy and self-determination.
The Treaty of Versailles, which was signed at the end of World War I, also had a significant impact on the development of nationalism in Europe. The treaty redrew the map of Europe and created a number of new, multi-ethnic countries in the remnants of the Ottoman Empire and Austro-Hungarian Empire. These new countries faced a number of challenges as they tried to integrate diverse ethnic groups and forge a national identity.
The emergence of the European Union (EU) trading block was also influenced by the desire to promote peace and stability in Europe. The EU was originally founded as a way to bring about economic integration and cooperation among European nations, with the hope that this would help to prevent future conflicts. While the EU has faced its share of challenges over the years, it has helped to promote peace and stability in Europe and has contributed to the longest period of peace in the continent's history.