Early Terre Haute was a center of farming, milling, and pork processing. However, the business and industrial expansion of the city prior to 1860 developed largely thanks to transportation. The Wabash River, the building of the National Road (now US 40) and the Wabash and Erie Canal linked Terre Haute to the world and broadened the city's range of influence. The economy was based on iron and steel mills, hominy plants, and, late in the 19th century, distilleries, breweries and bottle makers. Coal mines and coal operating companies developed to support the railroads, yet agriculture remained predominant, largely due to the role of corn in making alcoholic beverages and food items.