Social Justice and the City (1973) expressed Harvey's position that geography could not remain 'objective' in the face of urban poverty and associated ills. It has been cited widely (over 6600 times, by 2017, in a discipline where 50 citations are rare), and it makes a significant contribution to Marxian theory by arguing that capitalism annihilates space to ensure its own reproduction. Dialectical materialism has guided his subsequent work, notably the theoretically sophisticated Limits to Capital (1982), which furthers the radical geographical analysis of capitalism, and several books on urban processes and urban life have followed it. The Condition of Postmodernity (1989), written while a Professor at Oxford, was a best-seller (the London The Independent named it as one of the fifty most important works of non-fiction to be published since 1945, and it is cited 30,000 times by 2017). It is a materialist critique of postmodern ideas and arguments, suggesting these actually emerge from contradictions within capitalism itself. Justice, Nature and the Geography of Difference (1996) focuses on social and environmental justice (although its dialectical perspective has attracted the ire of some Greens). Spaces of Hope (2000) has an utopian theme and indulges in speculative thinking about how an alternative world might look. His study of Second Empire Paris and the events surrounding the Paris Commune in Paris, Capital of Modernity, is undoubtedly his most elaborated historical-geographical work. The onset of US military action since 2001 has provoked a blistering critique – in The New Imperialism (2003) he argues that the war in Iraq allows US neo-conservatives to divert attention from the failures of capitalism 'at home'. His next work, A Brief History of Neoliberalism (2005), provides an historical examination of the theory and divergent practices of neoliberalism since the mid-1970s. This work conceptualises the neoliberalised global political economy as a system that benefits few at the expense of many, and which has resulted in the (re)creation of class distinction through what Harvey calls "accumulation by dispossession". His book The Enigma of Capital (2010) takes a long view of the contemporary economic crisis. Harvey explains how capitalism came to dominate the world and why it resulted in the financial crisis. He describes that the essence of capitalism is its amorality and lawlessness and to talk of a regulated, ethical capitalism is to make a fundamental error. A series of events linked to this book across London academic forums, such as the LSE, proved hugely popular and sparked a new interest in Harvey's work.