New Zealand was one of the last major landmasses settled by humans. Radiocarbon dating, evidence of deforestation and mitochondrial DNA variability within Māori populations suggest New Zealand was first settled by Eastern Polynesians between 1250 and 1300, concluding a long series of voyages through the southern Pacific islands. Over the centuries that followed these settlers developed a distinct culture now known as Māori. The population was divided into iwi (tribes) and hapū (subtribes) which would cooperate, compete and sometimes fight with each other. At some point a group of Māori migrated to the Chatham Islands (which they named Rēkohu) where they developed their distinct Moriori culture. The Moriori population was decimated between 1835 and 1862, largely because of Māori invasion and enslavement, although European diseases also contributed. In 1862 only 101 survived and the last known full-blooded Moriori died in 1933.
The first Europeans known to have reached New Zealand were Dutch explorer Abel Tasman and his crew in 1642. In a hostile encounter, four crew members were killed and at least one Māori was hit by canister shot. Europeans did not revisit New Zealand until 1769 when British explorer James Cook mapped almost the entire coastline. Following Cook, New Zealand was visited by numerous European and North American whaling, sealing and trading ships. They traded food, metal tools, weapons and other goods for timber, food, artefacts, water, and on occasion sex. The introduction of the potato and the musket transformed Māori agriculture and warfare. Potatoes provided a reliable food surplus, which enabled longer and more sustained military campaigns. The resulting inter-tribal Musket Wars encompassed over 600 battles between 1801 and 1840, killing 30,000–40,000 Māori. From the early 19th century, Christian missionaries began to settle New Zealand, eventually converting most of the Māori population. The Māori population declined to
