Why are black people being ignored at the Oscars?

IN September 2014, Vulture published an article by Kyle Buchanan entitled, ‘Will This Be The Whitest Oscars in Almost Two Decades?’, in which he analysed recent predictions by 17 of the industry’s most accurate Oscar forecasters.
Buchanan calculated that white actors might take all 20 of the primary Oscar nominations, resulting in the first ceremony in years without an Asian, Hispanic, or black nominee.