Final answer:
The age of the automobile, chemical industry, and aviation predominantly flourished in the early twentieth century, with the 1920s being especially significant for technological advancements. Henry Ford's mass-produced Model T Ford revolutionized transportation, which, alongside aviation developments, reshaped urban spaces and living patterns.
Step-by-step explanation:
The age of the automobile, chemical industry, and aviation is generally considered to have begun in earnest in the early twentieth century. The most significant period within this age was the 1920s, which was marked by rapid technological advancements and cultural shifts. Henry Ford's introduction of the Model T Ford in the 1910s, which entered mass production, fundamentally changed transportation by making cars affordable to the average American. The automobile industry influenced the expansion of other industries, such as rubber, steel, and petroleum, fundamentally altering America's economic landscape.
Alongside the rise of the automobile, the early twentieth century also saw significant developments in aviation. After being demonstrated and improved upon in wartime, passenger airlines began offering scheduled flights in the late 1920s, though it was the mass production of automobiles that predominantly signalled the shift from public to private transportation. Cities and living patterns were reshaped around these new modes of transportation, leading to a dramatic change in how people perceived and navigated urban spaces.