Nationalism is advocacy of political independence for a particular country. the role that nationalism was mostly present only in Germany during napoleon's reign. it united many of napoleon's allied german states against the idea of being a French client state.
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It was on 9 November 1989, five days after half a million people gathered in East Berlin in a mass protest, that the Berlin Wall dividing communist East Germany from West Germany crumbled. East German leaders had tried to calm mounting protests by loosening the borders, making travel easier for East Germans.