Final answer:
The first vehicle sold under an import brand to become the best-selling automobile in the United States is the Honda Accord.
Step-by-step explanation:
The first vehicle sold under an import brand to become the best-selling automobile in the United States and known as the "Inspire" in its home country is the Honda Accord.
The Honda Accord was launched in 1976 and quickly gained popularity in the U.S. market due to its reliability, fuel efficiency, and affordability.
The success of the Honda Accord challenged the dominance of American automakers and paved the way for other Japanese import brands to enter and compete in the U.S. market.