Karl Popper makes the claim in the second volume of The Open Society and Its Enemies that Hegel's system formed a thinly veiled justification for the absolute rule of Frederick William III, and that Hegel's idea of the ultimate goal of history was to reach a state approximating that of 1830s Prussia. Popper further proposed that Hegel's philosophy served not only as an inspiration for communist and fascist totalitarian governments of the 20th century, whose dialectics allow for any belief to be construed as rational simply if it could be said to exist.