History of Tuvalu century as the result of a treaty between Great Britain and Germany relating to the demarcation of the spheres of influence in the Pacific Ocean. Each of the Ellice Islands was declared a British Protectorate by Captain Gibson of , between 9 and 16 October 1892. The Ellice Islands were administered as British protectorate by a Resident Commissioner from 1892 to 1916 as part of the British Western Pacific Territories (BWPT), and then as part of the Gilbert and Ellice Islands Colony from 1916 to 1976. The United States claimed Funafuti, Nukufetau, Nukulaelae and Niulakita under the Guano Islands Act
Geology of the Pacific Ocean . The Pacific Ocean developed from the Panthalassa, a vast global ocean, following the breakup of the supercontinent Pangaea in the Mesozoic Era, gradually forming Gondwana and Laurasia, which in turn divided. There is no firm date for when the changeover occurred, as the replacement of the sea bed is a continuous process, though reconstruction maps often change the name from Panthalassic to Pacific around the time the Atlantic Ocean began to open. The Panthalassic Ocean first opened around 750 million years ago at the breakup of Rodinia, but the oldest Pacific Ocean floor is only around 180 Ma old.