Where did the first settlers of western Micronesian islands such as Palau, Yap, and the Marianas likely come from?

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The first settlers of western Micronesian islands, specifically Palau, Yap, and the Marianas, likely originated from the Philippines and Indonesia.1

Archaeological evidence, such as radiocarbon dating from stratified deposits in the Marianas, suggests that these islands were occupied as early as 2000 BCE. These migrations are considered distinct from the later movements associated with the Lapita culture that settled other parts of the Pacific. While the languages spoken in these western islands are clearly Austronesian in their general affiliation, they remain relatively distinct from one another and from the languages of central and eastern Micronesia.231