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New Zealand uses the Mixed Member Proportional (MMP) voting system, which gives voters two votes: one for a political party and one for their local electorate MP. Voters will elect at least 120 members to the House of Representatives, with 71 electorate members and 49 list members.
The previous parliament was elected on September 20, 2014 and was set to expire on 10 October 2017 if not dissolved earlier. It was dissolved on August 22, 2017.
Wikipedia: The centre-right National Party, led by Prime Minister Bill English, has governed since 2008 in a minority government with confidence and supply from the Māori, ACT and United Future parties. The main opposition parties to the National government are Labour (the official opposition), led by Jacinda Ardern, the Green Party, and New Zealand First.
New Zealand election