Many reasons. But the main reason I’d say is. The USA popularized the assembly line for cars in the early 19th century.
This drastically reduced the cost of cars. Since cars were cheaper here infrastructure was built around cars.
The culture is also very “make your American dream” happen and independent minded. You can’t control a public transport. But you can a car. Thus a lot of movies (which Hollywood has a lot of exports) here have interstate travel centered around cars.
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