There are few childhood memories as distinct as those of family road trips. In her new book “Are We There Yet? The Golden Age of American Family Vacations,” Susan Sessions Rugh explains how the prosperous period between the end of World War II and the gas crisis of the 1970s gave Americans the unprecedented opportunity to see the country by car. What’s more, she uses the subject as a vehicle to explore American social norms and racial tensions of the time.

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