Answer: The Automobile industry
Step-by-step explanation:
In the 1920s, the Automobile industry had been revolutionized in no small part by Henry Ford which led to cars becoming so popular that everyone wanted to buy one.
This growth in the automobile industry led to growth in other industries that the automobile relied on such as oil which powered the car, glass which was used to make the cars, tourism which became easier to engage in with a car and road building which provided a conduit for cars to move.