During this period the fishery question again assumed considerable importance. The government at Washington raised the contention that the three miles' limit, to which their fishermen could be confined by the convention of 1818, should follow the sinuosities of the coasts, including the bays, the object being to obtain access to the valuable mackerel fisheries of the Bay of Chaleurs and other waters claimed to be exclusively within the territorial jurisdiction of the maritime provinces. The imperial government sustained the contention of the provinces--a contention practically supported by American authorities in the case of the Delaware, Chesapeake, and other bays on the coast of the United States--that the three miles' limit should be measured from a line drawn from headlands of all bays, harbours and creeks. In the case of the Bay of Fundy, however, the imperial government allowed a departure from this general principle, when it was urged by the Washington government that one of its headlands was in the territory of the United States, and that it was an arm of the sea rather than a bay. The result was that foreign fishing vessels were only shut out from the bays on the coasts of Nova Scotia and New Brunswick within the Bay of Fundy. All these questions were, however, placed in abeyance by the reciprocity treaty of 1854 (see p. 96), which lasted until 1866, when it was repealed by the action of the United States, in accordance with the provision bringing it to a conclusion after one year's notice from one of the parties interested.