ago mainland southeast asia remainders known negritos form small minority groups geographically isolated regions southeast asia dominated east asian related ancestry already bc predating expansion austroasiatic austronesian peoples ref name ncbinlmnihgov austroasiatic austronesian expansions maritime southeast asia late neolithic austronesian peoples form majority modern population brunei indonesia east timor malaysia philippines migrated southeast asia taiwan first seaborne human migration known austronesian expansion arrived northern philippines bc bc
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