http://www.slate.com/articles/news_and_politics/history/2015/06/charleston_church_shooting_for_black_americans_dylann_storm_s_attack_is.html

In trying to understand the historical context behind the massacre of nine people attending a prayer meeting at Emanuel African Methodist Episcopal Church, many people have pointed to the bombing of the 16^th Street Baptist Church in Birmingham, Alabama, or the string of arsons directed at Southern black churches in the 1990s. But black Americans know that the history of white terror against us, and our churches, runs much deeper than that. We know this vicious attack is only the latest manifestation of an intense hatred of black Americans that is stitched throughout the entire fabric of the nation’s history. Black American places of worship have represented a threat to white supremacy’s various forces since they emerged among free black populations living in cities throughout the U.S. in the late 18^th century.