In the same way that libertarian ideas had been lying around for Americans to pick up in the stagflated 1970s, young people coming of age in the disillusioned 2000s were handed powerful ideas about social justice to explain their world. The ideas came from different intellectual traditions: the Frankfurt School in 1920s Germany, French postmodernist thinkers of the 1960s and ’70s, radical feminism, Black studies. They converged and recombined in American university classrooms, where two generations of students were taught to think as critical theorists.