 The Tuvalu National Library and Archives holds "vital documentation on the cultural, social and political heritage of Tuvalu", including surviving records from the colonial administration, as well as Tuvalu government archives.Tuvaluans are a Polynesian people with the origins of the people of Tuvalu addressed in the theories regarding migration into the Pacific that began about 3000 years ago.There is evidence for a dual genetic origin of Pacific Islanders in Asia and Melanesia, which results from an analysis of Y chromosome (NRY) and mitochondrial DNA (mtDNA) markers; there is also evidence that Fiji playing a pivotal role in west-to-east expansion within Polynesia.