Much of the trade they exploited was in oil. As cars became mass-market conveniences in Europe and North America, crude went from the periphery of the shipping business to its very center. In an earlier era, ships collected their cargoes in industrial cities—Liverpool, Philadelphia, Montreal. In the new automobile age, the most important loading ports would include places like Mina Al Ahmadi, in Kuwait, and Ras Tanura, on the edge of Saudi Arabia’s seemingly limitless oil fields. Sixty percent of the growth in maritime trade between 1948 and 1973 was in “liquid cargo,” overwhelmingly petroleum
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