Biden and Trump's showdown in the November 2024 election is almost inevitable. This will be the first time since 1956 that there has been a "rematch" of candidates in a US presidential election, and the first time in 132 years that a former US president has faced off against his opponent who defeated him four years ago. Analysis suggests that this will inevitably deepen political and social divisions in the United States, giving rise to more chaos and risks.