Does history have a shape, or is it one thing after another? The philosophy of history is the attempt to answer that, and to say what drives the shape if there is one.
Vico's New Science (1725) made the early modern case: human history is intelligible in a way nature is not, because humans made it. Herder added that peoples develop along their own internal logic and not down a single universal road. Hegel gave the tradition its most ambitious form, reading history as the progressive realization of freedom through successive conflicts of consciousness, and set the terms for nearly everything after. Marx kept the directional structure and moved its engine to material production. The twentieth-century cyclical theorists kept the ambition and dropped the progress: Spengler's Decline of the West (1918-22), Toynbee's comparative account of civilizations rising and collapsing.
Karl Popper delivered the most serious attack. The Poverty of Historicism (1957) argued that theories claiming to find laws of historical development cannot be falsified, and that they cannot in principle predict the growth of knowledge on which the future depends. His further point was political: such theories supply certainty to the people acting on them, and that is what makes the error dangerous rather than merely academic.
Fukuyama reopened the Hegelian question in 1989, arguing not that events would stop but that no rival to liberal democracy retained ideological legitimacy. Most readers have taken the three decades since as a refutation; he has maintained they misread the claim.
The field's standing difficulty is that its central question is unusually hard to test. The periods when a directional account of history feels most obviously true have tended to be the periods when it was most obviously local.
