In my view the period that has had the biggest impact on the development of US society is The Great Depression. That depression brought a huge economic growth but also changed mass culture that swept many Americans into consumer society.
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Generally, Mandela employed non-violent approach, and mostly his imprisonment and his peacefull reaction to it gained international approval for the cause of ending apartheid.
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Karl Marx is a philosopher, he became famous for his philosophies on communism and capitalism.
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A is the best choice I think