How the ‘great replacement theory’ is connected to the Buffalo shooting?

An investigation into the weekend shooting of more than a dozen people at a western New York supermarket will turn on Monday to whether authorities missed tell-tale signs and red flags left by the teenage gunman prior to his racist killing spree.
Authorities said Payton Gendron, 18, carried out an act of “racially motivated violent extremism” when he opened fire with a semiautomatic rifle on May 14 at the Tops Friendly Market in Buffalo, where 11 of the 13 wounded were Black people.
A 180-page manifesto that circulated online, believed to have been authored by Gendron, outlined the “Great Replacement Theory”, a racist conspiracy theory that white people were being replaced by minorities in the United States and elsewhere.
US President Joe Biden and First Lady Jill Biden will visit Buffalo on Tuesday, the White House said in a statement.

Al Jazeera’s Alan Fisher explains.

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