Gilbert and Ellice Islands of Makin that commenced on 20 November 1943. Colonel Fox-Strangways, was the Resident Commissioner of the Gilbert and Ellice Islands Colony in 1941, who was located on Funafuti. After World War II, the colony headquarters was re-established on Tarawa, first on Betio islet and subsequently on Bairiki islet. By the Tokelau Act of 1948, sovereignty over Tokelau was transferred to New Zealand. The five islands of the Central and Southern Line Islands were added to the colony in 1972. The Tuvaluans were concerned about their minority status in the Gilbert and Ellice Islands Colony. In 1974, ethnic differences within the
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.