As the first Americans arrived, probably from the west or northwest, the northern zone was a thin band roughly comparable to the tundra of upper Canada. Farther south were forests similar to those of today’s Midwest. The people crossed a Mississippi River swollen with meltwater as it coursed southward from the glacial front.
But one cannot make strict analogies with modern environments, says University of Northern Iowa archeologist Michael Shott. “It was a complex patchwork,” he says. next >>