New Zealand is both a parliamentary democracy and a constitutional monarchy. It is a member of the Commonwealth of Nations, and Queen Elizabeth II is its head of state.
The Queen is represented in New Zealand by a Governor General who is appointed on the recommendation of the New Zealand's prime minister. The Governor General usually acts on the advice of ministers, but in some extreme situations he or she may exercise reserve powers such as dismissing a prime minister or dissolving Parliament.
The Queen's title in New Zealand is Elizabeth the Second, by the Grace of God, Queen of New Zealand and Her Other Realms and Territories, Head of the Commonwealth, Defender of the Faith.
Since the 19th century, some of New Zealand's Maori people have been represented by a traditional monarch, who is a respected figure but has no official role in New Zealand's government.
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A Concise History of New Zealand by Philippa Mein Smith. Considers the rugged land from its break from the supercontinent of Gondwana 80 million years ago to the beginning of the 21st century.
The Penguin History of New Zealand: Illustrated by Michael King. From prehistory to modern times.
Making Peoples by James Belich. A history of the New Zealanders, from Polynesian settlement to the end of the 19th century.
The Maori and the Crown: An Indigenous People's Struggle for Self-Determination by Dora Alves and Paul Cleveland. Details the interaction between the Maori leaders and the British Crown.
Wikipedia - New Zealand