A growing number of elected Republicans are openly promoting "white replacement theory," a decades-old conspiracy theory that's animated terrorist attacks, including the 1995 Oklahoma City bombing.

Why it matters: This mainstreams what once was the sole provenance of white supremacists.

What it is: "White replacement theory" posit the existence of a plot to change America's racial composition by methodically enacting policies that reduce white Americans' political power.

• The conspiracies encompass strains of anti-Semitism as well as racism and anti-immigrant sentiment.

Driving the news: Fox News host Tucker Carlson has for years alluded to elements of replacement theory. Former President Trump emboldened some believers, as well, including by retweeting accounts that identified themselves as believers in "white genocide."

• Carlson's recent defiance, in the face of the Anti-Defamation League's calls for him to resign, have put these conspiracies back into the spotlight, along with the pronouncements of some high-profile elected officials.
• Rep. Matt Gaetz (R-Fla.) last week tweeted an explicit endorsement of WRT. Gaetz later tweeted that he doesn't think of replacement "solely on race/ethnicity terms," blaming "the Left" for taking him out of context.

.@TuckerCarlson is CORRECT about Replacement Theory as he explains what is happening to America.

The ADL is a racist organization. https://t.co/32Vu60HrJK

— Matt Gaetz (@mattgaetz) September 25, 2021

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How we got here: Far-right and white supremacist groups in the U.S. and Europe have latched onto several iterations of these conspiracies, accusing liberals of plotting against white people either with public policy or violence.

• "White genocide" is believed to have been coined by the late David Lane, an American neo-Nazi who in 1984 was convicted for his role in the murder of Jewish radio host Alan Berg.
• Lane was part of a domestic terrorist group called The Order, named after a fictional terrorist group in a racist book called The Turner Diaries, which inspired Timothy McVeigh and other mass murderers.
• The Turner Diaries and another WRT novel called The Camp of the Saints recently saw their online values surge.

A "reconquista" theory, similar to WRT, spread for years in the American Southwest. Some conservatives promoted claims about Mexican Americans wanting California, New Mexico and other swaths of the region to be given to Mexico.