If there were no airplanes today, travel would primarily be done by other modes of transportation such as trains, cars, buses and boats. The document discusses the rise of trains and industrialization in the 19th century in the United States, including the introduction of steam locomotives in 1830, expansion of railroad track mileage, and completion of the transcontinental railroad in 1869. It also covers related topics such as corporations, immigration, westward expansion and politics during this period of growth.