The meatpacking industry in the Midwest refers to the large-scale processing of livestock into meat products, which became a crucial part of the region's economy in the late 19th and early 20th centuries. This industry was instrumental in supporting westward expansion by providing a reliable food source for both settlers and urban populations, leading to significant demographic and economic shifts. The growth of the meatpacking industry was fueled by innovations in transportation, such as railroads, which allowed for the quick movement of livestock and finished products across the country.