Manuel DeLanda provides the first detailed overview of the assemblage theory found in germ in Deleuze and Guattari's writings. Through a series of case studies, DeLanda shows how the concept can be applied to economic, linguistic, and military history as well as to metaphysics, science, and mathematics. DeLanda then presents the real power of assemblage theory by advancing it beyond its original formulation allowing for the integration of communities, institutional organizations, cities and urban regions. And he challenges Marxist orthodoxy with a Leftist politics of assemblages.