 These peoples were assimilated linguistically and culturally by incoming Austronesian peoples in what is now modern-day Indonesia and Malaysia.Several authors have also proposed that Kra-Dai speakers may actually be an ancient daughter subgroup of Austronesians that migrated back to the Pearl River delta from Taiwan and/or Luzon shortly after the Austronesian expansion.Later migrating further westwards to Hainan, Mainland Southeast Asia and Northeast India.