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Integration in the American foreign-exchange market under the nineteenthcentury specie standard is examined using a newly developed series of the dollar- sterling exchange rate and estimates of specie-point spreads. A distinction is made between internal and external integration. The latter is much more important over the entire 1791 to 1900 time span, but by 1881–1900 the market is tightly integrated in both senses. The long-term trend of improved integration is interrupted only by wartime.