PBS
Pbs: American Experience: Timeline of Farming in the u.s.
Presents a timeline of the history of farming in the U.S. between 1850 and 1933. Highlights include the Homestead Act of 1862, the Agricultural Act of May 1933, Emergency Farm Mortgage Act, and The Federal Surplus Relief Corporation.
American Association for the Advancement of Science
American Association for Advancement of Science: The Slow Birth of Agriculture
An article which describes the slow process of crop cultivation. The author argues that crop cultivation and village life may not have been connected.
Cornell Lab of Ornithology
Habitat Network: On a Farm
Learn about the effect that agricultural advancement has had on bird diversity in those environments.
Wessels Living History Farm
Living History Farm: Crop Rotation
A history of crop rotation in the United States. Once an incentive from the New Deal, farmers were paid to plant certain crops or let the soil lie fallow.
Northern Arizona University
Land Use History of North America: Irrigation Systems Chaco Canyon Anasazi
Scroll down to find title. Explanation and photographs of water drainage canals at Chaco Canyon and Mesa Verde Complexes.