What is the secret of Polynesian migration?

There is a Polynesian archipelago in the South Pacific. It is 3 ~ 4 thousand nautical miles away from Asia, Africa, America and Australia. When the inhabitants of the island were discovered by European explorers, they could only make canoes. This raises a question, where do Polynesians come from? Who are their ancestors? Until the end of the 20th century, the ethnic origin of Polynesians was still controversial and unresolved. Regarding the indigenous people, Spanish scholar Kiros and French navigator Dumont d 'Urville believe that Polynesians are an indigenous people. These islands are surrounded by rough seas, which separate them from the mainland. Ancient ancestors could not have sailed from the mainland thousands of nautical miles away. Dumont d 'Urville also believes that Polynesia was originally a complete continent. Due to geological changes or other reasons, the main continents have sunk into the sea and become dotted islands. The survivors on the islands are the ancestors of modern Polynesians. The flood myth circulated among Polynesians is probably the historical memory of the sinking of the mainland. But archaeology proves that there are no ancient human fossils in Polynesia, and the earliest residents immigrated from other places in the 5th century.

Norwegian marine archaeologist heyerdahl visited Peru and Polynesia in America. He found a legend among Polynesians that a god named Tiki led the ancestors of Polynesians to come here from the East on a raft. In Peru, there is a similar legend: Tiki led the tribe to create a culture, and then led the people to leave the western continent on a raft when the alien invaded, heading west, and I don't know where they went. The name and deeds of this god are very similar in two places. This caused heyerdahl to think deeply. Legends always contain some real elements. Judging from these phenomena, the ancestors of ancient Polynesians may have come from America. In the further investigation of the cultures of the two places, he found more similarities. Heyerdahl was convinced that Polynesians originated in America. But what tools did Polynesian ancestors use to cross thousands of nautical miles of ocean? Heyerdahl knew from legend that they were on a raft. On the ancient tombstone in Peru, he saw the style of this raft. In order to prove the possibility of Tiki's ocean migration, they built an imitation raft and set sail from callao Port in Peru. 10 1 days later, the wind and ocean currents sent him to La Roya Island in Polynesia, with a total distance of nearly 4,300 nautical miles. On this basis, he believes that Polynesians originated in America. It is entirely possible for ancient ancestors to sail on rafts. Polynesians must have come from other places. But where did they come from? How did it come into being? Why did you move? When did you move? What kind of tools are used? These question marks inspire people to discover.