This week in New Zealand saw one of the biggest protests its seen for decades. A nine-day march ending in the capital Wellington – with a demonstration of around 55,00 people outside parliament house. The protesters are opposing the introduction of a bill which seeks to reinterpret New Zealand’s founding document between the British Crown and Māori chiefs and there are fears it will dilute the rights of the Māori.  This is the story of the treaty that defines New Zealand.