Derrida's prior work in deconstruction, on concepts of trace and différance in particular, serves as the foundation of his formulation of hauntology, fundamentally asserting that there is no temporal point of pure origin but only an "always-already absent present". His writing in "Spectres" is marked by a preoccupation with the "death" of communism after the 1991 fall of the Soviet Union, in particular after theorists such as Francis Fukuyama asserted that capitalism had conclusively triumphed over other political-economic systems and reached the "end of history".