 Complete the following phrase:  The Falkland Islands were reportedly first spotted by the English navigator John Davis on 14 August 1592. The earliest conclusive sighting of the islands was done by Sebald de Weert around eight years later. This was followed by the first documented landing in 1690 by John Strong, who named the sound dividing the two largest islands after Anthony Cary, 5th Viscount Falkland. The name was subsequently extended to the islands themselves. Sovereignty over the Falklands changed hands between the British and the Spanish throughout the 18th century. The United Provinces of South America asserted its sovereignty over the islands in 1820, four years after the United Provinces 