New Zealand is an island country located in the southwestern Pacific Ocean. The country geographically comprises two main landmasses ‒ that of the North and South Islands ‒ and numerous smaller islands. New Zealand is situated some 1,500 kilometres (900 mi) east of Australia across the Tasman Sea and roughly 1,000 kilometres (600 mi) south of the Pacific island nations of New Caledonia, Fiji, and Tonga. Because of its remoteness, it was one of the last lands to be settled by humans.
During its long isolation, New Zealand developed a distinctive biodiversity of both animal and plant life. Most notable are the large number of unique bird species, many of which became extinct after the arrival of humans and introduced mammals. With a mild maritime climate, the land was mostly covered in forest. The country's varied topography and its sharp mountain peaks owe much to the tectonic uplift of land and volcanic eruptions caused by the Pacific and Indo-Australian Plates clashing beneath the earth's surface.
Polynesians settled New Zealand in 1250–1300 CE and developed a distinctive Māori culture, and Europeans first made contact in 1642 CE. The introduction of potatoes and muskets triggered upheaval among Māori early during the 19th century, which led to the inter-tribal Musket Wars. In 1840 the British and Māori signed a treaty making New Zealand a colony of the British Empire. Immigrant numbers increased sharply and conflicts escalated into the New Zealand Wars, which resulted in much Māori land being confiscated in the mid North Island. Economic depressions were followed by periods of political reform, with women gaining the vote during the 1890s, and a welfare state being established from the 1930s. After World War II, New Zealand joined Australia and the United States in the ANZUS security treaty, although the United States later, until 2010, suspended the treaty after New Zealand banned nuclear weapons. New Zealand is part of the
