hi! Hopefully some of the NZ specialists will drop by to address this question, but meanwhile, you can get a little start here

• Why has New Zealand embraced indigenous culture more than other former British Colonies? - /u/Cenodoxus makes a few comments on adoption of the Haka

.. and if you're interested in New Zealand history with regard to Maori integration more generally, this thread may be useful; it includes links to a few more (including the above post)

• Why were the Maori so much more successful at resisting colonization than Australian Aborigines or other Pacific Islanders? - featuring /u/b1uepenguin

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