At the turn of the twentieth century, the automobile industry was genuinely undecided about which power source would win out. Of the roughly 4,000 cars produced in the United States in 1900, historians estimate that electric vehicles made up around a third of the market, competing directly against steam-powered and gasoline-powered vehicles, each with real advantages: electric cars were quiet, didn't require the physically demanding hand-cranking gasoline engines needed to start, and produced no exhaust or engine noise, making them especially popular for urban use and specifically marketed toward women drivers of the era. Inventor Thomas Edison himself worked for years, alongside Henry Ford, on improving electric vehicle battery technology, believing electric cars represented the format's likely future.
The decisive shift toward gasoline happened over roughly the following two decades, driven by several compounding factors rather than a single cause: Henry Ford's moving assembly line, introduced for the Model T from 1913, dramatically cut gasoline car production costs in a way electric manufacturers, working at smaller scale with expensive battery technology, couldn't match; the discovery of cheap Texas crude oil from 1901 made gasoline increasingly affordable; growing road networks connecting distant towns favored gasoline cars' far longer range over electric vehicles' limited battery capacity; and Charles Kettering's 1912 invention of the electric starter motor eliminated gasoline cars' hand-crank disadvantage, removing one of electric vehicles' clearest remaining practical advantages. By the 1920s, electric cars had been reduced to a small niche, and gasoline-powered internal combustion had become the automobile industry's overwhelming global default for the following century.