Agriculture has for the most part successfully met the food and material needs of people and industries. Generally, industries develop in rapid bursts that follow from economic innovations, instead of developing at a gradual and continuous pace. The development of agriculture is also closely linked to technological innovations and conditions elsewhere in the economy. However, few if any previous studies have examined how agriculture has reorganized in terms of industry input-output relationships. In this poster, We examine when and how agriculture has undergone changes within the US, through a comparative analysis of agricultural activities as reflected in input output tables over time.