Topic summary
Maize agriculture
Extracted from the Wikipedia article Maize.
Spreading to the north
Around 4,500 years ago, maize began to spread to the north. Maize was first cultivated at several sites in New Mexico and Arizona about 4,100 years ago. During the first millennium AD, maize cultivation spread more widely in the areas north. In particular, the large-scale adoption of maize agriculture and consumption in eastern North America took place about A.D. 900. Native Americans cleared large forest and grassland areas for the new crop. The rise in maize cultivation 500 to 1,000 years ago in what is now the southeastern U.S. corresponded with a decline of freshwater mussels, which are very sensitive to environmental changes.