The Tulsa Race Massacre

For decades, there were no public ceremonies, memorials for the dead or any efforts to commemorate the events of May 31-June 1, 1921. Instead, there was a deliberate effort to cover them up.
 

The Tulsa Tribune removed the front-page story of May 31 that sparked the chaos from its bound volumes, and scholars later discovered that police and state militia archives about the riot were missing as well. As a result, until recently the Tulsa Race Massacre was rarely mentioned in history books, taught in schools or even talked about.
 

Scholars began to delve deeper into the story of the riot in the 1970s, after its 50th anniversary had passed. In 1996, on the riot’s 75th anniversary, a service was held at the Mount Zion Baptist Church, which rioters had burned to the ground, and a memorial was placed in front of Greenwood Cultural Center.

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Source: History.com