Final answer:
After Reconstruction, one major change in agriculture was the increased mechanization of farming, which brought new technology and tools that improved efficiency and productivity.
Step-by-step explanation:
After Reconstruction, one major change in agriculture was the increased mechanization of farming. The Industrial Revolution brought new technology to agriculture, such as gasoline-powered farm tools like tractors, seed drills, threshers, and combine harvesters. These advancements helped farmers increase efficiency and productivity.