Effects of nationalism are can sometimes be destructive.
Explanation:
For example, hither loved his country (Germany) so much that he thought his country should be number one always and his race (Aryans) should dominate the word, so he set out to conquer the world which failed miserably.
Summary:
Too much nationalism can cause a widespread idea of superiority which can cause a globel conflict.
Answers & Comments
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Summary:
Much shorter summary:
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Correct me if I'm wrong :D