New Zealand government levied a poll tax on Chinese immigrants up until the 1930s, when Japan went to war with China. New Zealand finally abolished the poll tax in 1944. An influx of Jewish refugees from central Europe came in the 1930s. Many of the persons of Polish origin in New Zealand arrived as orphans from Eastern Poland via Siberia and Iran in 1944 during World War II. Post-Second World War European immigration With the agencies of the United Nations dealing with humanitarian efforts following the Second World War, New Zealand accepted about 5,000 refugees and displaced persons from Europe, and more than 1,100 Hungarians between 1956 and 1959 (see Refugees in New Zealand). The post-WWII immigration included more persons from Greece, Italy, Poland and the former Yugoslavia. New Zealand limited immigration to those who would meet a labour shortage in New Zealand. To encourage those to come, the Government introduced free and assisted passages in 1947, a schema expanded by the First National Government in 1950. However, when it became clear that not enough skilled migrants would come from the British Isles alone, recruitment began in Northern European countries. New Zealand signed a bilateral agreement for skilled migrants with the Netherlands, and a large number of Dutch immigrants arrived in New Zealand. Others came in the 1950s from Denmark, Germany, Switzerland and Austria to meet needs in specialised occupations. By the 1960s, the policy of excluding people based on nationality yielded a population overwhelmingly European in origin. By the mid-1960s, a desire for cheap unskilled labour led to ethnic diversification. Māori The Māori people are most likely descended from people who emigrated from Taiwan to Melanesia and then travelled east through to the Society Islands. After a pause of 70 to 265 years, a new wave of exploration led to the discovery and settlement of New Zealand in about AD 1250–1300, making New Zealand one of the most recently settled major landmasses. Some researchers have suggested an earlier wave of arrivals dating to as early as AD 50–150; these people then either died out or left the islands. Over the following centuries the Polynesian settlers developed into 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 where they developed