Surinam (Dutch: Suriname) was a Dutch plantation colony in the Guianas, neighboured by the equally Dutch colony of Berbice to the west, and the French colony of Cayenne to the east. Surinam was a Dutch colony from 26 February 1667, when Dutch forces captured Francis Willoughby's English colony during the Second Anglo-Dutch War, until 15 December 1954, when Surinam became a constituent country of the Kingdom of the Netherlands. The status quo of Dutch sovereignty over Surinam, and English sovereignty over New Netherland, which it had conquered in 1664, was kept in the Treaty of Breda of 31 July 1667, and again confirmed in the Treaty of Westminster of 1674.