When the newcomers moved west, they were preceded by a wave of disease and then a wave of ecological disturbance. The former crested with fearsome rapidity; the latter sometimes took more than a century to tamp down, and it was followed by many aftershocks. “The virgin forest was not encountered in the sixteenth and seventeenth centuries,” wrote historian Stephen Pyne, “it was invented in the late eighteenth and early nineteenth centuries.” Far from destroying pristine wilderness, that is, Europeans bloodily created it.
