This event is believed to have begun with the arrival of the first humans using rafts or boats at least 67,000 years ago as the 2007 discovery of Callao Man suggested. Negrito groups first inhabited the isles. Groups of Austronesians later migrated to the islands. (dec 28, 1897 – feb 11, 1903)
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 https://en.wikipedia.org/wiki/History_of_the_Philippines 
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