Answer :
Final answer:
John Dodge significantly advanced the American automotive industry by manufacturing high-quality engines, transmissions, and chassis. He contributed to Detroit's reputation as the automotive capital and was part of an era that saw mass production and widespread car ownership.
Explanation:
John Dodge, along with his brother Horace, played a significant role in the early years of the American automotive industry by manufacturing high-quality engines, transmissions, and chassis. The Dodge brothers started their own company in 1914 after initially being suppliers to other carmakers, helping lay the groundwork for Detroit's emergence as the automotive capital of the world. Their contributions were part of a broader movement in the early 20th century that saw innovators like Ransom Olds and Henry Ford revolutionize the industry with strategies such as the assembly line, which significantly reduced the cost of car production and made automobiles accessible to the masses.