1491_ New Revelations of the Americas Before Columbus - Charles C. Mann [183]
Seton made his estimate in 1929, and it is still widely quoted today. Ecologists have since employed more sophisticated theoretical tools to produce new, lower population estimates; ethologist Dale Lott put the number of bison in “primitive America” at twenty-four to twenty-seven million in 2002. Nonetheless, most continue to accept Seton’s basic thesis: the Americas seen by the first colonists were a wildland of thundering herds and forests with sky-high trees and lakes aswarm with fish. Increasingly, though, archaeologists demand a caveat. The Americas seen by the first colonists were teeming with game, they say. But the continents had not been that way for long. Indeed, this Edenic world was largely an inadvertent European creation.
At the time of Columbus the Western Hemisphere had been thoroughly painted with the human brush. Agriculture occurred in as much as two-thirds of what is now the continental United States, with large swathes of the Southwest terraced and irrigated. Among the maize fields in the Midwest and Southeast, mounds by the thousand stippled the land. The forests of the eastern seaboard had been peeled back from the coasts, which were now lined with farms. Salmon nets stretched across almost every ocean-bound stream in the Northwest. And almost everywhere there was Indian fire.
The Indian impact on American ecosystems was transformative, subtle, and persistent, as suggested by these photographs of remnant Native American maize hills in the outskirts of Northampton, Massachusetts, in the 1920 s. Maize had not grown in these abandoned pastures for centuries, but the handiwork of the land’s original inhabitants remained for those with eyes to see it.
Agricultural terraces like these in Peru’s Colca Valley still cover thousands of square miles in Mesoamerica and the Andes, mute testimony to Native Americans’ enduring success in managing their landscapes.
This grand Indian irrigation system near Pisco, a coastal town south of Lima, fell to developers’ bulldozers—the photograph dates from 1931.
South of the Río Grande, Indians had converted the Mexican basin and Yucatán into artificial environments suitable for farming. Terraces and canals and stony highways lined the western face of the Andes. Raised fields and causeways covered the Beni. Agriculture reached down into Argentina and central Chile. Indians had converted perhaps a quarter of the vast Amazon forest into farms and agricultural forests and the once-forested Andes to grass and brush (the Inka, worried about fuel supply, were planting tree farms).
All of this had implications for animal populations. As Cahokia grew, Woods told me, so did its maize fields. For obvious reasons its farmers did not relish the prospect of buffalo herds trampling through their fields. Nor did they want deer, moose, or passenger pigeons eating the maize. They hunted them until they were scarce around their homes. At the same time, they tried to encourage these species to grow in number farther away, where they would be useful. “The net result was to keep that kind of animal at arm’s length,” Woods told me. “The total number of bison, say, seems to have gone down quite a bit, but they wanted to have them available for hunting in the prairie a couple days’ journey away.”
When disease swept Indians from the land, this entire ecological ancien régime collapsed. Hernando De Soto’s expedition staggered through the Southeast for four years in the early sixteenth century and saw hordes of people but apparently didn’t see a single bison. (No account describes them, and it seems unlikely that chroniclers would have failed to mention sighting such an extraordinary beast.) More than a century later the French explorer La Salle canoed down the Mississippi. Where De Soto had found prosperous cities La Salle encountered “a solitude unrelieved by the faintest trace of man,” wrote the nineteenth-century historian Francis