Where were all the people?

ok basically i want to know where the hell were all the people that built the massive statue and stuff on the island unless along with loomin jacob can build and is a construction expert but seriously where the hell are all the people that build it as it was before the boat, (not certain ti is the black rock as black rock is in the jungle and unless thye pick the boat and move it inland... well) but yeah what the hell? ideas?

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