Observers not only considered the isolated incidents that led to the deaths of Trayvon Martin and Mike Brown, they looked at the longer history of similar events, from the absolute power of life and death slaveowners had held over black slaves to the decades of lynching during the Jim Crow era, when few of the murderers had paid for their crimes against black people and their communities. Even in the past few years, the list of black human beings who have become hashtags has grown ever longer—Stephon Clark, Philando Castile, Freddie Gray, Walter Scott, Jamar Clark, Rekia Boyd, Eric Garner,
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