Final answer:
After Henry Ford developed his gas-powered car, the Model T, and introduced mass production techniques, automobiles became affordable to the wider public, leading to a huge increase in car ownership and significant societal changes.
Step-by-step explanation:
According to the article, what happened after Henry Ford developed his gas-powered car was a significant transformation in the industry and society. The development of Henry Ford's Model T and the use of mass production made automobiles affordable and common, creating a cascade of social and economic changes. After Ford introduced the Model T in 1908, which was affordable and reliable, there was an increase in the demand for petroleum and a shift from electric vehicles to gasoline-powered vehicles due to advantages such as superior range and quick refueling. This led to the growth of businesses relating to the automobile industry, changes in city infrastructure, and a surge in car ownership. Furthermore, Ford's assembly line innovation contributed massively to increased production efficiency, leading to a significant decrease in the price of the Model T from $850 in 1908 to $300 in 1924. As affordability increased, so did accessibility, and by 1929, over twenty-three million automobiles were present on American roads. Not only were automobiles produced in record numbers, but they also became an integral part of American culture and economics. Hence, Ford's work post-development of the Model T essentially marked the beginning of the automotive age and had a profound effect on the 20th century and beyond.