Automobiles
One of the distinguishing characteristics of human beings is that they have always been mobile. From its origins on the African continent, the human species has traversed the earth and populated every continent but Antarctica. For most of human existence, land travel was entirely dependent on human and animal muscle power. Radical changes came in the nineteenth century with the invention of steam-powered locomotives, and toward the end of the century the first automobiles powered by internal combustion engines were created in several industrially developed countries. By the first decade of the twentieth century automobile ownership was expanding at a rapid rate in the United States, and this pattern was followed in subsequent decades in many other parts of the world.
Cars gave people an unparalleled ability to go where they wanted, when they wanted, and with whom they wanted. In short, they promised freedom. Early motorists eagerly took advantage of this freedom, embarking on long journeys despite miserable road conditions and the uncertain reliability of their vehicles. By the 1920s automobile ownership had been democratized in the United States as manufacturing innovations dramatically lowered purchasing prices, giving rise to an era of mass motorization.
In the early-twenty-first century car ownership has expanded to such an extent that in many industrial nations the ratio of cars to people approaches or even exceeds one to two.
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