Ten years ago, Trayvon Martin was fatally shot by George Zimmerman, who perceived the unarmed teenager as a threat. He would later be acquitted of all charges in the killing, arguing successfully that he had acted in self defense. These events reignited the conversation about race and justice in America. "The contemporary civil rights movement unfolded directly in response to the murder of Trayvon Martin,” says Henry Louis Gates Jr. in a new Opinion video. Former President Barack Obama argues that Trayvon's death "was the start of America looking inward and in fits and starts coming to terms with what has always been our original sin."

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