Though Donald Trump has made it into a catchphrase, he didn’t come up with the metaphor “drain the swamp.”

By making fun of professors who spoke in language that most people considered incomprehensible (“The Lesbian Phallus”), wealthy Ivy League graduates could pose as anti-elite. By mocking courses on writers such as Alice Walker and Toni Morrison, they made a racial appeal to white people who felt as if they were losing their country. As the 1990s wore on, because multiculturalism was associated with globalisation – the force that was taking away so many jobs traditionally held by white working-class people – attacking it allowed conservatives to displace responsibility for the hardship that many of their constituents were facing. It was not the slashing of social services, lowered taxes, union busting or outsourcing that was the cause of their problems. It was those foreign “others”.