<span>They established the idea that leaders should have limits on their power.<span>
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It was a kind of social protest - people did not want to be discriminated because of their race or sex. This event was a precedence - nobody thought that something like this protest could occur at that time. Rosa Parks did something that made people think about tolerance and also made other people join her protest in different places.
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That would be 4 Japan, where they dropped the two nuclear bombs in Nagasaki and Hiroshima