The details of the development toward the peaceful federation are given by Kant's universal history. This narrative is presented as, at best, consistent with empirical evidence. Kant argues that, for the most part, human psychology and the natural environment, rather than human reason, could have driven the human race forward. First, he attributes progress to the “unsocial sociability” (1784, 44) of human beings. Humans are social because they cannot develop their capabilities in isolation.