NPR recently posted an article addressing the question of whether or not regionalism still remains an issue in politics today. I wondered myself how much regionalism impacted things...then and now. In the colonial period and early federal era, regionalism shaped the foods people ate, largely because the infrastructure had not been implemented yet to support the widespread flow of food products over long distances. Some trade between states occurred, but it was not until after the 1820s, and the start of industrialization in America, that the technology and infrastructure existed to connect distant markets.
Some food historians argue that regionalism became less important and industrialization "homogenized" the food supply. However, others show how regionalism never fully disappeared and continued to serve as a means of creating culinary diversity.