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For centuries, land travel was restricted to how fast and far humans or animals could walk. In the 19th century, the invention of the bicycle transferred human energy to a set of wheels. During the Industrial Revolution, the invention of the steam engine led to the railroad, a change in transportation that created the tourist industry. In the early 20th century, the invention of the automobile forever changed how humans travel, and with the assembly line, Henry Ford forever changed how goods are manufactured.
