The "big lie" about the 2020 US presidential election spread quickly because of a number of factors. 
Firstly, the modern age of information and the prevalence of social media meant that false claims could spread rapidly and easily. 
Secondly, political polarization and the echo chambers it creates meant that people were predisposed to believe the claims.
Thirdly, the profit incentives of the news media meant that sensational headlines and clickbait articles were prioritized over accurate reporting, which furthered the reach of false claims.
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