In the 1970s in the US, the critique of technology became the basis of a new political perspective called anarcho-primitivism, which was forwarded by thinkers such as Fredy Perlman, John Zerzan, and David Watson. They proposed differing theories about how it became an industrial society, and not capitalism as such, that was at the root of contemporary social problems. This theory was developed in the journal Fifth Estate in the 1970s and 1980s, and was influenced by the Frankfurt School, the Situationist International, Jacques Ellul and others.