AdvertisementPoliticsFederalImmigration Opinion How a conspiracy theory embraced by Trump became part of mainstream Australian politics Melanie La'Brooy Writer August 12, 2026 — 3:10pmAugust 12, 2026 — 3:10pm Save You have reached your maximum number of saved items. There is the problem, which is the threat of immigrant invasion; the cause, widely believed to be an organised conspiracy named the great replacement theory and the solution, known as remigration. While the concept of invasion is familiar, the great replacement theory and the term remigration have only relatively recently entered the political mainstream. Bloomberg They’re not wrong, however, to claim that the great replacement theory is terrifying, only they completely misidentify who has the most reason to be fearful of it. Since 2017, believers in the theory have been responsible for over a dozen mass murders, including the Australian Christchurch killer, who murdered 51 Muslims in 2019 and titled his manifesto “The Great Replacement”.