After a great many surprising statements Kant's essay Idea for a Universal History with a Cosmopolitan Aim offers the reader a truly amazing one in the end: namely, that the description of history that Kant envisages may itself contribute to history's moving towards the aim that history, in that account, is said to have. That aim, the “cosmopolitan aim” of the essay's title, is “the perfect civil union of the human species” (8:29), and Kant claims that philosophers describing history as pursuing that aim thereby help history to reach it. In what follows I shall investigate first what this help is supposed to consist in and second on what grounds Kant can claim that philosophy will be helpful in this way.

Here is the Ninth Proposition, the passage putting forward Kant's claim most explicitly:

“Possible” presumably means something like “feasible” here, since merely to claim that one could make the attempt so to describe history would seem trivial – of course one can try that. In calling this enterprise possible, Kant is probably asserting that it can be completed, that this enterprise is not bound to fail. On what this confidence is based need not concern us at the moment.