__________ began the practice of annual model changes for cars.
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Q4: Automobile ownership became a necessity for most
Q5: The growing dependence on automobiles created _
Q6: The National Highway Traffic Safety Administration began
Q7: The decline of the American automobile industry
Q8: _ resulted in lower priced cars, which
Q10: Some of the first highways were built
Q11: The first federal law allocating money to
Q12: The word "smog" was invented by residents
Q13: _ pioneered emissions control standards for cars.
Q14: The Oil Embargo of 1973 caused gasoline
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