Kant's "naturalistic" history of mankind? Some reservations

Among many important claims, Allen Wood in Kant's Ethical ought proposes that Kant's philosophy of history can be grasped as a "naturalist" approach, grounding human nature in biology. I suggest some reservations. First, I question Kant's conception of biology as (a still emergent) science. Second, I question Kant's extension of his notion of "natural predisposition" to reason and freedom. Third, I question the naturalism of Kant's philosophy of history by suggesting the excessive role providence must play in Kant's account. The upshot is to find Kant's philosophy of history one of the less persuasive elements in his system of thought, despite Wood's energetic effort at a contemporary reconstruction.