For 10 points, name these native people of New Zealand.
Thor Heyerdahl's theory of this people's origin is based on the fact that the staple crop kumara originates in South America. The first king of this people was Potatu. One treaty to which this group was a party was negotiated by William Hobson and signed by Hone Heke, and is treated as a founding document of the modern nation in which this people resides. For 10 points, name these native people of New Zealand.
Thor Heyerdahl's theory of this people's origin is based on the fact that the staple crop kumara originates in South America.
{Maori}