New Zealand is responsible for the Cook Islands' defence and foreign affairs, but these responsibilities are exercised in consultation with the Cook Islands. In recent times, the Cook Islands have adopted an increasingly independent foreign policy. Cook Islanders are citizens of New Zealand, but they also have the status of Cook Islands nationals, which is not given to other New Zealand citizens. The Cook Islands have been an active member of the Pacific Community since 1980.
The Cook Islands' main population centres are on the island of Rarotonga (13,007 in 2016), where there is an international airport. There is also a larger population of Cook Islanders in New Zealand itself: in the 2013 census, 61,839 people said they were Cook Islanders, or of Cook Islands descent.
With over 168,000 visitors travelling to the islands in 2018, tourism is the country's main industry, and the leading element of the economy, ahead of offshore banking, pearls, and marine and fruit exports.
The Cook Islands were first settled around AD 1000 by Polynesian people who are thought to have migrated from Tahiti, an island 1,154 kilometres (717 mi) to the northeast of the main island of Rarotonga.
The first European contact with the islands took place in 1595 when the Spanish navigator Álvaro de Mendaña de Neira sighted the island of Pukapuka, which he named San Bernardo (Saint Bernard). Pedro Fernandes de Queirós, a Portuguese captain at the service of the Spanish Crown, made the first European landing in the islands when he set foot on Rakahanga in 1606, calling the island Gente Hermosa (Beautiful People).
The British navigator Captain James Cook arrived in 1773 and again in 1777 giving the island of Manuae the name Hervey Island. The Hervey Islands later came to be applied to the entire southern group. The name "Cook Islands", in honour of Cook, first appeared on a Russian naval chart published by Adam Johann von Krusenstern in the 1820s.
In 1813 John Williams, a missionary on the Endeavour (not the same ship as Cook's) made the first recorded European sighting of Rarotonga. The first recorded landing on Rarotonga by Europeans was in 1814 by the Cumberland; trouble broke out between the sailors and the Islanders and many were killed on both sides. The islands saw no more Europeans until English missionaries arrived in 1821. Christianity quickly took hold in the culture and many islanders are Christians today.
The islands were a popular stop in the 19th century for whaling ships from the United States, Britain and Australia. They visited, from at least 1826, to obtain water, food, and firewood. Their favourite islands were Rarotonga, Aitutaki, Mangaia and Penrhyn.
The Cook Islands became a British protectorate in 1888, largely because of community fears that France might occupy the islands as it already had Tahiti. On 6 September 1900, the islanders' leaders presented a petition asking that the islands (including Niue "if possible") should be annexed as British territory. On 8 and 9 October 1900, seven instruments of cession of Rarotonga and other islands were signed by their chiefs and people. A British Proclamation was issued, stating that the cessions were accepted and the islands declared parts of Her Britannic Majesty's dominions. However, it did not include Aitutaki. Even though the inhabitants regarded themselves as British subjects, the Crown's title was unclear until the island was formally annexed by that Proclamation. In 1901 the islands were included within the boundaries of the Colony of New Zealand by Order in Council under the Colonial Boundaries Act, 1895 of the United Kingdom. The boundary change became effective on 11 June 1901, and the Cook Islands have had a formal relationship with New Zealand since that time.
When the British Nationality and New Zealand Citizenship Act 1948 came into effect on 1 January 1949, Cook Islanders who were British subjects automatically gained New Zealand citizenship. The islands remained a New Zealand dependent territory until the New Zealand Government decided to grant them self-governing status. On 4 August 1965, a constitution was promulgated. The first Monday in August is celebrated each year as Constitution Day. Albert Henry of the Cook Islands Party was elected as the first Premier and was knighted by Queen Elizabeth II. Henry led the nation until 1978, when he was accused of vote-rigging and resigned. He was stripped of his knighthood in 1979. He was succeeded by Tom Davis of the Democratic Party who held that position until March 1983.
In March 2019, it was reported that the Cook Islands had plans to change its name and remove the reference to Captain James Cook in favour of "a title that reflects its 'Polynesian nature'". It was later reported in May 2019 that the proposed name change had been poorly received by the Cook Islands diaspora. As a compromise, it was decided that the English name of the islands would not be altered, but that a new Cook Islands Māori name would be adopted to replace the current name, a transliteration from English. Discussions over the name continued in 2020.