Well a republic is a state in which supreme power is held by the people and their elected representatives, and which has an elected or nominated president rather than a monarch and a democracy is a system of government by the whole population or all the eligible members of a state, typically through elected representatives.
It affected the society because Martin Luther King was a very good leader who wasn't afraid of advocating for human rights, especially Black people human rights. When he got killed, that affected the society because people feared that if they advocated for people rights, they would get shot and killed just as MLK did.
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Correct me if I'm wrong but I believe the answer is that they Developed new artistic styles that rejected traditional ideas about art.
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