The Greater Seminole fields became a top US oil producer in the 1920s. This caused a spike in population in the town of Seminole and __________.

The oil boom brought a rapid increase in people and supplies moving into and out of Seminole. That traffic also increased railroad activity, making the town’s depot one of the world’s busiest. The correct choice is “increased railroad traffic, making the town’s depot one of the world’s busiest.”

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