Owing to their remoteness, the islands of New Zealand were the last large habitable landmass to be settled by humans. Between about 1280 and 1350, Polynesians began to settle in the islands and then developed a distinctive Māori culture. In 1642, the Dutch explorer Abel Tasman became the first European to sight and record New Zealand. In 1840, representatives of the United Kingdom and Māori chiefs signed the Treaty of Waitangi, which declared British sovereignty over the islands. In 1841, New Zealand became a colony within the British Empire, and in 1907 it became a dominion; it gained full statutory independence in 1947, and the British monarch remained the head of state. Today, the majority of New Zealand's population of 5 million is of European descent; the indigenous Māori are the largest minority, followed by Asians and Pacific Islanders. Reflecting this, New Zealand's culture is mainly derived from Māori and early British settlers, with recent broadening of culture arising from increased immigration. The official languages are Māori and New Zealand Sign Language, with English being dominant and a de facto official language.