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Black American civil rights leader Martin Luther King (1929 - 1968) addresses crowds during the March On Washington at the Lincoln Memorial, Washington DC, where he gave his 'I Have A Dream' speech. (Photo by Central Press/Getty Images)

Black American civil rights leader Martin Luther King (1929 - 1968) addresses crowds during the March On Washington at the Lincoln Memorial, Washington DC, where he gave his 'I Have A Dream' speech.   (Photo by Central Press/Getty Images)