Final answer:
Henry Ford's contributions to the automobile industry through the implementation of the assembly line and mass production techniques made cars more affordable and accessible to the average American.
Step-by-step explanation:
Henry Ford made significant contributions to the automobile industry by perfecting the assembly line and implementing mass production techniques. These advancements in manufacturing allowed for the production of cars at a faster rate and lower cost, making them more affordable for the average American. Without Henry Ford's contributions, the automobile industry would not have experienced the same level of growth and accessibility that it did.