visitor was the Albatross in 1899. That ship arrived in Tonga seeking a resupply of water, food, and wood. The islands most regularly visited by Westerners were Ata, 'Eua, Ha'apai, Tongatapu and Vava'u. Sometimes, Tongan men were recruited to serve as crewmen on these vessels. The United States Exploring Expedition visited Tonga in 1840. In 1845, an ambitious young Tongan warrior, strategist, and orator named Tāufaʻāhau united Tonga into a kingdom. He held the chiefly title of Tuʻi Kanokupolu, but had been baptised by Methodist missionaries with the name Siaosi ("George") in 1831. In 1875, with the help of missionary Shirley Waldemar Baker, he declared Tonga a constitutional monarchy; formally adopted the Western royal style; emancipated the "serfs"; enshrined a code of law, land tenure, and freedom of the press; and limited the power of the chiefs. Tonga became a protected state under a Treaty of Friendship with Britain on 18 May 1900, when European settlers and rival Tongan chiefs unsuccessfully tried to oust the man who had succeeded Tāufaʻāhau as king. The treaty posted no higher permanent representative on Tonga than a British consul (1901–1970). Under the protection of Britain, Tonga maintained its sovereignty, and remained the only Pacific nation to retain its monarchical government. The Tongan monarchy follows an uninterrupted succession of hereditary rulers from one family. The 1918 flu pandemic, brought to Tonga by a ship from New Zealand, killed 1,800 Tongans, a mortality rate of about 8%. The Treaty of Friendship and Tonga's protection status ended in 1970 under arrangements that had been established by Tonga's Queen Salote Tupou III before her death in 1965. Owing to its British ties, Tonga joined the Commonwealth in 1970 (atypically as a country that had its own monarch, rather than having the United Kingdom's monarch, along with Malaysia, Lesotho, and Eswatini). Tonga became a member of the United Nations in September 1999. While exposed to colonial pressures, Tonga has always governed itself, which makes it unique in the Pacific. In January 2022, the Hunga Tonga–Hunga Ha'apai volcano, north of the main island of Tongatapu, erupted, causing a tsunami which inundated parts of the archipelago, including the capital Nukualofa. The eruption affected the kingdom heavily, cutting off most communications and killing four people in Tonga, including a British national who ran an animal shelter and died trying to save her dogs. In Peru, two women drowned due to abnormal tsunami