Short answers, pulled from the story.
Tuvalu is an archipelago in the Polynesian sub-region of Oceania, situated roughly midway between Hawaii and Australia. It lies east-northeast of the Santa Cruz Islands, northeast of Vanuatu, southeast of Nauru, and north of Fiji, between latitudes 5 and 10 degrees south.
The 2022 census recorded a population of 10,643, making Tuvalu the 194th most populous country in the world, exceeding only Niue and the Vatican City in population. About 86% of the population belongs to the Congregational Christian Church of Tuvalu.
Tuvalu became a fully independent sovereign state on the 1st of October 1978, when it joined the Commonwealth. Toaripi Lauti became the country's first prime minister on that date, which is now celebrated as Independence Day.
Tuvalu's highest point is only 4.6 metres above sea level, making it the second-lowest country by maximum elevation after the Maldives. The sea level at Funafuti has risen at roughly 3.9 millimetres per year, about twice the global average. Estimates suggest a rise of 20-40 centimetres over the next century could make the islands uninhabitable.
The Falepili Union is a bilateral treaty signed on the 10th of November 2023. It provides a pathway for 280 Tuvaluan citizens to migrate to Australia each year for climate-related mobility, and commits Australia to increasing contributions to the Tuvalu Trust Fund and the Tuvalu Coastal Adaptation Project.
Christianity arrived in 1861 when Elekana, a deacon from a Congregational church in Manihiki in the Cook Islands, was caught in a storm and drifted for eight weeks in a canoe before landing at Nukulaelae on the 10th of May 1861. He had been trained at Malua Theological College, a London Missionary Society school in Samoa, and began preaching after he arrived.