Question: When did the location where Ekuran spent his childhood become part of the United States?

full_context: Document 1: Noriaki Kano: Noriaki Kano completed his undergraduate, masters, and doctoral degrees in the engineering school of the University of Tokyo. He retired from the Tokyo University of Science (TUS) after 35 years in research and education, as a lecturer and associate professor at the University of Electro-Communications and a full professor and head of the Department of Management Science at TUS.
Document 2: Honolulu: In 1845, Kamehameha III moved the permanent capital of the Hawaiian Kingdom from Lahaina on Maui to Honolulu. He and the kings that followed him transformed Honolulu into a modern capital, erecting buildings such as St. Andrew's Cathedral, ʻIolani Palace, and Ali ʻiōlani Hale. At the same time, Honolulu became the center of commerce in the islands, with descendants of American missionaries establishing major businesses in downtown Honolulu.
Document 3: 51st state: Cuba, like many Spanish territories, wanted to break free from Spain. A pro-independence movement in Cuba was supported by the U.S., and Cuban guerrilla leaders wanted annexation to the United States, but Cuban revolutionary leader José Martí called for Cuban nationhood. When the U.S. battleship Maine sank in Havana Harbor, the U.S. blamed Spain and the Spanish–American War broke out in 1898. After the U.S. won, Spain relinquished claim of sovereignty over territories, including Cuba. The U.S. administered Cuba as a protectorate until 1902. Several decades later in 1959, the corrupt Cuban government of U.S.-backed Fulgencio Batista was overthrown by Fidel Castro. Castro installed a Marxist–Leninist government allied with the Soviet Union, which has been in power ever since.
Document 4: Paul Gunn: After Japan's surrender in World War II, Gunn turned to rebuilding his Philippine Air Lines. The company provided flights across the south Paciific Ocean. Gunn died when his plane crashed in a storm over the Philippines on October 11, 1957. There were no survivors.
Document 5: Katsuaki Asai: Asai started training under aikido's founder Morihei Ueshiba aged 13, at the Hombu dojo in Tokyo, and continued during his studies at Meiji University. He was sent to Germany by Kisshomaru Ueshiba in 1965 to teach aikido, and has lived in the country ever since. His first occupation was to teach aikido to policemen in Münster, and he now runs a school in Düsseldorf.
Document 6: Ivan Morris: Ivan Morris was born in London, of mixed American and Swedish parentage to Edita Morris and Ira Victor Morris (son of diplomat Ira Nelson Morris and grandson of meat-packer Nelson Morris). He studied at Gordonstoun, before graduating from Phillips Academy. He began his study of Japanese language and culture at Harvard University, where he received a BA. He received a doctorate at the School of Oriental and African Studies in London. He wrote widely on modern and ancient Japan and translated numerous classical and modern literary works. Ivan Morris was one of the first interpreters sent into Hiroshima after the explosion of the bomb.
Document 7: Cho Chikun: Cho was born into a very rich family of six children. His grandfather was a bank director. During the Korean War, the money the family had owned was burnt and they became impoverished. His father then sought the advice of a fortune teller. Originally called Pung-yeon, Cho's name was changed to Chihun, as the fortune teller told him to change his son's name to Chihun or else his mother would die, also saying that following the change, Chihun's younger brother would die but Chihun would become famous. Both predictions proved accurate.His grandfather taught him Go when he was young. Seeing great talent in Cho, his father sent him to Japan in 1962. His rise to becoming one of the greatest Go players began when he joined Minoru Kitani's Go school. He was accompanied by his uncle Cho Namchul and his brother Cho Shoen on his way to the Haneda airport in Japan in August 1962. He was only six years old at the time. At the airport he met Minoru Kitani and his wife, another pupil Kobayashi Chizu, and the master's daughter, Reiko Kitani (who as an adult married Cho's future rival Koichi Kobayashi). The day after arriving in Japan Cho beat Rin Kaiho in a five stone handicap game at a party held at the Kitani School to celebrate the total dan ranks of Kitani students reaching a sum of 100. A large crowd watched intensely, as if it were a professional game.
Document 8: Kenji Fujimori: Kenji Fujimori was born to Japanese Peruvian engineers, Alberto Fujimori, at the time dean of the science faculty of the National Agrarian University in Lima, and later President of Peru, and Susana Higuchi. He has three elder siblings. His father won the 1990 presidential elections, in 1992 he suspended the constitution and neutralized the Congress and the opposition. Kenji's mother soon disagreed with her husband, and they divorced in 1994. After this, Kenji's 19-year-old sister Keiko was named "First Lady". Alberto Fujimori resigned in 2001 after a massive corruption scandal and went to exile in Japan. He was extradited to Peru and sentenced to jail in 2007.
Document 9: 51st state: Before Alaska and Hawaii became states of the United States in 1959, the corresponding expression was ``the 49th state ''.
Document 10: Gyo Obata: Gyo Obata (born February 28, 1923) is an American architect, the son of painter Chiura Obata and his wife, Haruko Obata, a floral designer. In 1955, he co-founded the global architectural firm HOK (formerly Hellmuth, Obata + Kassabaum). He lives in St. Louis, Missouri and still works in HOK's St. Louis office. He has designed several notable buildings, including the McDonnell Planetarium at the Saint Louis Science Center, the Independence Temple of the Community of Christ church, the National Air and Space Museum in Washington, D.C., and the Abraham Lincoln Presidential Library and Museum in Springfield, Illinois.
Document 11: Hawaii: Hawaii (English: / həˈwaɪ. i, - ji, - ʔi / (listen) hə - WY - (y) ee; Hawaiian: Hawai ʻi (həˈvɐjʔi)) is the 50th and most recent state to have joined the United States of America, having received statehood on August 21, 1959. Hawaii is the only U.S. state located in Oceania and the only one composed entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean. Hawaii is the only U.S. state located outside North America.
Document 12: Hawaii: The Kingdom of Hawai ʻi was sovereign from 1810 until 1893 when the monarchy was overthrown by resident American and European capitalists and landholders. Hawaii was an independent republic from 1894 until August 12, 1898, when it officially became a territory of the United States. Hawaii was admitted as a U.S. state on August 21, 1959.
Document 13: Kenji Ekuan: Born in Tokyo on September 11, 1929, Ekuan spent his youth in Hawaii. At the end of World War II, he moved to Hiroshima, where he witnessed the atomic bombing of the city, in which he lost his sister and his father, a Buddhist priest. He said the devastation motivated him to become a "creator of things".  Later he attended Tokyo National University of Fine Arts and Music (present-day Tokyo University of the Arts). In 1957, he founded GK Industrial Design Laboratory (ＧＫインダストリアルデザイン研究所). "GK" stood for "Group of Koike", as Koike was the name of an associate professor at the university.In 1970, he became president of the Japan Industrial Designers' Association and five years later he was elected as president of the International Council of Societies of Industrial Design.During his lifetime he served as chair of the Japan Institute of Design, dean of Shizuoka University of Art and Culture was and a trustee of the Art Center College of Design.Ekuan died in the hospital in Tokyo on February 8, 2015, at the age of 85.
Document 14: Overthrow of the Hawaiian Kingdom: The overthrow of the Kingdom of Hawaii began on January 17, 1893, with a coup d'état against Queen Liliuokalani on the island of Oahu by foreign residents residing in Honolulu, mostly United States citizens, and subjects of the Kingdom of Hawaii. They prevailed upon American minister John L. Stevens to call in the U.S. Marines to protect American interests, an action that effectively buttressed the rebellion. The revolutionaries established the Republic of Hawaii, but their ultimate goal was the annexation of the islands to the United States, which finally occurred in 1898.
Document 15: History of Hawaii: The native population succumbed to disease brought by the Europeans (particularly smallpox), declining from 300,000 in the 1770s over 60,000 in the 1850s to 24,000 in 1920. Americans within the kingdom government rewrote the constitution, severely curtailing the power of King ``David ''Kalākaua, and disenfranchising the rights of most Native Hawaiians and Asian citizens to vote, through excessively high property and income requirements. This gave a sizeable advantage to plantation owners. Queen Liliuokalani attempted to restore royal powers in 1893, but was placed under house arrest by businessmen with help from the US military. Against the Queen's wishes, the Republic of Hawaii was formed for a short time. This government agreed on behalf of Hawaii to join the US in 1898 as the Territory of Hawaii. In 1959, the islands became the state of Hawaii of the United States.
ground_truth: August 12, 1898
sub_queries: Where did Ekuan spend his childhood? Answer: Hawaii
when did Hawaii become a part of the united states Answer: August 12, 1898