The document was a response to concerns over the lawlessness of British subjects in New Zealand and to a fear that France would declare sovereignty over the islands. It also arose from a desire in Maori society to establish a form of Maori government.
The hereditary chiefs and heads of the tribes of the Northern parts of New Zealand declared the constitution of an independent state. They agreed to meet in Waitangi each year to frame laws, and invited the southern tribes of New Zealand to "lay aside their private animosities" and join them.
A copy of the document was sent to the King of the United Kingdom, asking him to be the protector of the new state.
However the claim to independence only lasted until the signing of the Treaty of Waitangi in 1840 which totally is a urban myth. Article 2 of the Te Tiriti of Waitangi is in fact the Declaration of the Independence. The second article of the Te Tiriti of Waitangi guarantees to the chiefs, their continued chieftainship, and ownership of their lands and treasures (taonga). It also specifies that Maori will sell land only to the Crown.
The chiefs signed this declaration of independence and in the process established themselves as representing a proto-state under the title of the "United Tribes of NewZealand".
Most NewZealanders consider the Treaty of Waitangi as the founding document of the nation of New Zealand/Aotearoa, with formal sovereignty vested in the British crown, but the existence of different versions of this treaty, in both Māori and English, and its brevity, leave this subject to arguments over the preferred interpretation.
Note that NewZealanders overall seem to have little interest in asserting a definitive independence break from Britain as a focus of national identity, preferring to stress ethnic co-operation and an independent foreign policy as markers of nationhood while maintaining a nostalgic respect or connection with the former metropolitan power.
Declaringindependence or supporting such a declaration is seen as a hostile act that may easily lead to war.
Declaration of Independence of Guinea-Bissau (1973) - Guinea-Bissau, formerly Portuguese Guinea, declaredindependence from Portugal in 1973.
Declaration of Independence of the Turkish Republic of Northern Cyprus (1983) - The Turkish Republic of Northern Cyprus was proclaimed in northern Cyprus in 1983.