1500 to 1866 · Africanspan
The full ledger of the Atlantic trade, counted twice
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I built this entry from the Slave Voyages databases directly rather than from a textbook, because the textbook number and the database number are two different objects and the difference is the finding. The recorded transatlantic file holds 36,108 voyages between 1514 and 1866, carrying 10,665,568 people embarked and 9,202,995 landed. Across the 34,182 voyages that record both figures, the matched gap is 1,394,228 people. That gap is the Middle Passage stated as a subtraction. Separately there is the estimated universe, roughly 12.5 million embarked, which is what scholars believe actually happened including the voyages nobody wrote down. Never add the transatlantic file to the intra-American file of 11,521 voyages, because the same people appear in both. The recorded number is what survived paperwork. The estimated number is what happened. Keeping both on the page is the honest way to publish this.