The history of New Zealand (Aotearoa) dates back to between 1320 and 1350 CE, when the main settlement period started, after it was discovered and settled by Polynesians, who developed a distinct Māori culture. Like other Pacific cultures, Māori society was centred on kinship links and connection with the land but, unlike them, it was adapted to a cool, temperate environment rather than a warm, tropical one. The first European explorer known to visit New Zealand was Dutch navigator Abel Tasman on 13 December 1642. In 1643 he charted the west coast of the North Island, his expedition then sailed back to Batavia without setting foot on New Zealand soil. British explorer James Cook, who reached New Zealand in October 1769 on the first of his three voyages, was the first European to circumnavigate and map New Zealand. From the late 18th century, the country was regularly visited by explorers and other sailors, missionaries, traders and adventurers. In 1840 the Treaty of Waitangi was signed between representatives of the United Kingdom and various Māori chiefs, bringing New Zealand into the British Empire and giving Māori the same rights as British subjects. Disputes over the differing translations of the Treaty and settler desire to acquire land from Māori led to the New Zealand Wars from 1843. There was extensive British settlement throughout the rest of the 19th century and into the early part of the next century. The effects of European infectious diseases, the New Zealand Wars and the imposition of a European economic and legal system led to most of New Zealand's land passing from Māori to Pākehā (European) ownership, and Māori became impoverished. The colony gained responsible government in the 1850s. From the 1890s the New Zealand Parliament enacted a number of progressive initiatives, including women's suffrage and old age pensions. After becoming a self-governing Dominion with the British Empire in 1907, the country remained an enthusiastic member of the empire, and over 100,000 New Zealanders fought in World War I as part of the New Zealand Expeditionary Force. After the war, New Zealand signed the Treaty of Versailles (1919), joined the League of Nations, and pursued an independent foreign policy, while its defence was still controlled by Britain. When World War II broke out in 1939, New Zealand contributed to the defence of Britain and the Pacific War; the country contributed some 120,000 troops. From the 1930s the