Agriculture developed into Montana's top industry from humble beginnings. In 1841, Father De Smet planted a small plot at St. Mary's Mission. Thomas Harris, the territory's first farmer, harvested oats at Fort Owen for "sustenance and trade" in 1854. Within thirty-five years, beef and wool were being exported out of the territory to satisfy national and European demands. In the intervening years, the mechanical engine and rural electrification dramatically...