The federal postal system played a crucial role in national expansion. It facilitated expansion into the West by creating an inexpensive, fast, convenient communication system. Letters from early settlers provided information and boosterism to encourage increased migration to the West, helped scattered families stay in touch and provide neutral help, assisted entrepreneurs to find business opportunities, and made possible regular commercial relationships between merchants and the West and wholesalers and factories back east. The postal service likewise assisted the Army in expanding control over the vast western territories. The widespread circulation of important newspapers by mail, such as the "New York Weekly Tribune", facilitated coordination among politicians in different states. The postal service helped to integrate already established areas with the frontier, creating a spirit of nationalism and providing a necessary infrastructure.