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The Trump administration has repeatedly revised or contradicted its own projections for when and how Americans would receive a coronavirus vaccine. (Video: JM Rieger/The Washington Post)

The rapid development of coronavirus vaccines is an incontrovertible success story in the United States — and one that not everyone saw happening as quickly as it did.

During the Republican National Convention in August, President Trump’s promise to “produce a vaccine before the end of the year — or maybe even sooner” drew skepticism in some circles. Just over three months later, multiple vaccines are on the verge of receiving emergency authorizations in the United States.