Answer :
Final answer:
The maps of Europe in 1815 and 1914 show changes in national boundaries and the emergence of new countries. The Congress of Vienna in 1815 played a significant role in causing these changes.
Explanation:
The key differences between the maps of Europe in 1815 and 1914 are the changes in national boundaries and the emergence of new countries. In 1815, Europe was dominated by empires, but by 1914, there was a trend towards nations based on factors like ethnicity, language, customs, and religion. The major event that caused these changes was the Congress of Vienna, which took place after Napoleon's defeat. The Congress aimed to redefine the borders of European countries and maintain peace, leading to changes in national territories.
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