Thread by @USATODAY

August 28 marks a significant day in black history. So much so that director Ava DuVernay made it the focus of an orientation film for the Smithsonian’s National Museum of African American History and Culture. Here are a few key events. (Photo: AP)

August 28, 1833: Slavery was abolished in the U.K. and throughout the British empire. (Photo: Getty)

August 28, 1955: Emmett Till, 14, was brutally beaten and shot to death by white men in Mississippi. The trial around his death galvanized the civil rights movement. emmetttill.usatoday.com (Photo: AP)

August 28, 1963: Martin Luther King, Jr. delivered his iconic “I Have A Dream” speech in Washington, D.C., as the March on Washington became the largest civil rights demonstration the nation’s capital had ever seen. (Photo: AP) usat.ly/1c3e6pq #IHaveADream

August 28, 2005: Hurricane Katrina made landfall in Louisiana, and the resulting devastation disproportionately impacted black residents of New Orleans and surrounding areas. usat.ly/1JhwOux

August 28, 2008: Sen. Barack Obama became the first black man to win the nomination of a major party for president. usat.ly/18kDOlh (Source: @NMAAHC)

Correction: An earlier tweet in a Twitter thread misstated the landfall of Hurricane Katrina. It was Aug 29.

@ItalianinNOLA @Kristine_Froeba @RogueYogi @dziban303 @andrewlainjr_jr @desier_galjour @timpaulin Thanks all! You’re right! New Orleans was evacuated on Aug. 28 and made landfall on Aug. 29.