Tamaryū Daizō (born 22 July 1954 as Daizō Nagata) is a former sumo wrestler from Nagasaki, Japan.
 He made his professional debut in January 1970, and reached the top division in May, 1982.
 He was the last man to fight Takamiyama, the first foreigner to win a top division tournament, in May 1984.
 He won the "jūryō" division championship in March 1985.
 His highest rank was "komusubi" which he held for one tournament in November 1987 at the age of 33.
 It had taken him 106 tournaments from his professional debut to reach the rank, which is the slowest ever.
 Following the retirement of Kurama in September 1989 he became the oldest man in any of the professional sumo divisions.
 He retired in January, 1992 after a 22 year career, having fallen into the "makushita" division for the first time in seven years.
 As he had been unable to purchase or borrow elder stock in the Japan Sumo Association he had to leave the sumo world.
 He managed a sumo tea house in Utsunomiya, Tochigi Prefecture, until it closed in 2013.
Kotoōshū Katsunori (琴欧洲 勝紀) (legal name: Karoyan Andō, born February 19, 1983 as Kaloyan Stefanov Mahlyanov, Bulgarian: Калоян Стефанов Махлянов , in Dzhulyunitsa, Veliko Tarnovo Province, Bulgaria) is a former professional sumo wrestler or "rikishi".
 He made his debut in 2002, reaching the top division just two years later.
 In 2005 he reached the rank of "ōzeki" or 'champion', the second-highest level in the sumo ranking system behind only "yokozuna."
 On May 24, 2008, Kotoōshū made history by becoming the first European sumo wrestler to win an Emperor's Cup.
 He was one of the longest serving "ōzeki" in sumo history, holding the rank for 47 consecutive tournaments until November 2013.
 In January 2014 Kotoōshū obtained Japanese citizenship, a requirement of becoming an elder in the Japan Sumo Association, and he announced his retirement during the following tournament in March.
 In April 2017 he opened his own training stable, Naruto.
Akinoshima Katsumi (born 16 March 1967 as Katsumi Yamanaka) is a former sumo wrestler from Akitsu, Hiroshima Prefecture, Japan.
 He made his professional debut in 1982, and after reaching the top division in 1988 he remained there for 15 years.
 His highest rank was "sekiwake."
 He was known as the "giant killer" having defeated more "yokozuna" than any other untitled wrestler ("maegashira") in the history of sumo, earning himself 16 "gold stars" or "kinboshi" over his career, four more than his nearest "kinboshi" earning rivals, Takamiyama and Tochinonada.
 He also has received 19 performance prizes ("sanshō"), another record in sumo history.
Kōji Kitao (born August 12, 1963) is a former sumo wrestler and professional wrestler, born in Mie, Japan.
 He was sumo's 60th "yokozuna", and the only "yokozuna" in sumo history not to win a top division tournament championship.
 He was forced to leave sumo at the end of 1987 after a falling-out with his stable master Tatsunami, and became a professional wrestler in 1990.
The Musashigawa stable (武蔵川部屋 Musashigawa-beya?)
 is a stable of sumo wrestlers, part of the Dewanoumi ichimon or group of stables.
 It is an off-shoot of the better known stable of the same name set up by former "yokozuna" Mienoumi in 1981, that changed its name to Fujishima stable when former "ōzeki" Musōyama took over as head coach in September 2010.
 Former "yokozuna" Musashimaru branched off from this stable in April 2013 after taking on the elder name of his former head coach, starting a new stable using the Musashigawa name, and starting a new generation of Musashigawa stable.
 This is the second stable in sumo history to be headed (and founded) by a foreign-born former sumo wrestler after Takamiyama's Azumazeki stable.
 The head coach's nephew is a wrestler at the stable under the shikona of Musashikuni and is ranked in the makushita division as of 2017.
 The stable is also home to the half Japanese, half African-American wrestler Wakaichiro.
Ryūichi Yamamoto (山本 龍一 , Yamamoto Ryūichi , born May 8, 1984) , known by his "shikona" Yamamotoyama Ryūta (山本山 龍太 ) , or simply Yama, is a Japanese retired sumo wrestler from the city of Saitama in Saitama Prefecture.
 He made his professional debut in January 2007, and reached the top "makuuchi" division in January 2009.
 His highest rank was "maegashira" 9.
 At 265 kg , Yamamotoyama is the heaviest Japanese-born sumo wrestler in history, and is also thought to be the heaviest Japanese person ever.
 In April 2011, he was told to retire by the Japan Sumo Association after he and several other wrestlers were found to be involved in match-fixing.
 He now lives in Los Angeles and participates in sumo exhibitions and amateur tournaments, often alongside Ulambayaryn Byambajav.
Akebono Tarō (曙 太郎 , Akebono Tarō , born Chadwick Haheo Rowan; 8 May 1969) is an American-born Japanese professional wrestler and former sumo wrestler from Waimānalo, Hawaii.
 Joining the professional sport in Japan in 1988, he was trained by pioneering Hawaiian sumo wrestler Takamiyama and rose swiftly up the rankings, reaching the top division in 1990.
 After two consecutive "yusho" or tournament championships in November 1992 and January 1993 he made history by becoming the first non-Japanese-born wrestler ever to reach "yokozuna", the highest rank in sumo.
Takamiyama Daigorō (髙見山 大五郎 , born 16 June 1944 as Jesse James Wailani Kuhaulua) is a former sumo wrestler, the first foreign born wrestler to win the top division championship (in 1972).
 His highest rank was "sekiwake".
 His active career spanned twenty years from 1964 to 1984, and he set a number of longevity records, including most tournaments ranked in the top "makuuchi" division, and most consecutive top division appearances.
 He is also the first foreign born wrestler ever to take charge of a training stable, founding Azumazeki stable in 1986.
 His most successful wrestler was fellow Hawaiian Akebono who reached the highest rank of "yokozuna" in 1993.
 He retired as a coach in 2009.
Invasion Attack was a professional wrestling pay-per-view (PPV) promoted by New Japan Pro-Wrestling (NJPW).
 The event took place on April 7, 2013, in Tokyo at Ryōgoku Kokugikan.
 The event featured nine matches, five of which were contested for championships.
 As part of the "invasion" theme, the event featured title matches involving championships from Consejo Mundial de Lucha Libre (CMLL) and the National Wrestling Alliance (NWA) as well as participation from outside workers Akebono and Bob Sapp.
 It was the first event under the Invasion Attack name.
Nankairyū Tarō (born 22 February 1965 as Kilifi Sapa) is a former sumo wrestler from Samoa.
 His highest rank was "maegashira" 2.
 He was the third foreign-born wrestler to reach the top "makuuchi" division after Takamiyama and Konishiki.
 However he quit sumo suddenly in September 1988 after an argument with the head coach of Takasago stable about his persistent drinking problem.
 He subsequently had a brief spell as a professional wrestler with New Japan.

Question: In which country was the professional wrestler who was trained by pioneering Hawaiian sumo wrestler Takamiyama and a participant of Invasion Attack born?
Answer: American-born