Question: Julius Jackson is the son of the boxer from which territory?

full_context: Document 1: Julian Jackson (boxer): Julian Jackson (born September 12, 1960) is a former professional boxer from the U.S. Virgin Islands who competed from 1981 to 1998. He is a three-time world champion in two weight classes, having held the WBA super welterweight title from 1987 to 1990, and the WBC middleweight title twice between 1990 and 1995. Possessing formidable knockout power, Jackson is regarded by many as the hardest puncher in boxing history, pound for pound, and was ranked number 25 by "The Ring" magazine in a 2003 list of "100 Greatest Punchers".
Document 2: Joe Calzaghe: Joseph William Calzaghe, {'1': ", '2': ", '3': ", '4': "} ( ; born 23 March 1972) is a Welsh former professional boxer who competed from 1993 to 2008. He is a two-weight world champion, having held the unified WBA (Super), WBC, IBF, WBO, "Ring" magazine, and lineal super-middleweight titles, as well as the "Ring" light-heavyweight title. Calzaghe is the longest-reigning super-middleweight world champion in boxing history, having held the WBO title for over 10 years and making 21 successful defences before moving up to light-heavyweight. As his super-middleweight and light-heavyweight reigns overlapped, he retired with the longest continual time as world champion of any active fighter.
Document 3: Anthony Joshua: As of May 2017, Joshua is ranked as the world's best heavyweight by the Transnational Boxing Rankings Board and BoxRec, and second best by "The Ring". His knockout-to-win ratio stands at 100%. Joshua is the second British boxer, after James DeGale, to win both a gold medal at the Olympics and a world title by a major professional sanctioning body, as well as being the first British heavyweight to do so. He is also the second boxer, after Joe Frazier, to win a world heavyweight title whilst still reigning as Olympic champion at the top weight.
Document 4: Justin Juuko: Justin "The Destroyer" Juuko (born 26 December 1972 in Masaka) is a Ugandan amateur light flyweight and professional feather/super feather/light/light welter/welterweight boxer of the 1990s, 2000s and 2010s who as an amateur won the gold medal at light flyweight in the Boxing at the 1990 Commonwealth Games in Auckland, New Zealand, and as a professional won the World Boxing Council (WBC) International super featherweight title, World Boxing Council (WBC) FECARBOX super featherweight title, African Boxing Union (ABU) light welterweight title, North American Boxing Federation (NABF) super featherweight title, and Commonwealth super featherweight title, and was a challenger for the interim World Boxing Association (WBA) World super featherweight title against Antonio Hernandez, World Boxing Council (WBC) super featherweight title against Floyd Mayweather, Jr., International Boxing Association (IBA) super featherweight title against Diego Corrales, World Boxing Union (WBU) super featherweight title against Michael Gomez, International Boxing Association (IBA) lightweight title against Rustam Nugaev, Global Boxing Union (GBU) light welterweight title against Gábor Vető, his professional fighting weight varied from 125 lb , i.e. featherweight to 143 lb , i.e. welterweight.
Document 5: Klitschko brothers: Vitali Klitschko (born 19 July 1971) and Wladimir Klitschko (born 25 March 1976), collectively known as the Klitschko brothers are Ukrainian heavyweight boxers. During their peak years from 2004 until 2015, the Klitschko brothers were considered the most dominant heavyweight champions of their era, and amongst the most successful champions in boxing history. After the retirement of boxing legend Lennox Lewis, the Klitschko brothers held all heavyweight boxing world titles. Known for their exceptionally large frames and robotic boxing styles, the Klitschko brothers developed a style that utilized their athleticism and using their reach to break down opponents.
Document 6: Jim Johnson (boxer): "Battling" Jim Johnson (September 2, 1887 – November 6, 1918) was an American boxer who fought as a heavyweight from 1908 to 1918. He had little success and lost with great frequency to top boxers such as Sam Langford, Joe Jeanette, Sam McVey, Harry Wills and Kid Norfolk. In spite of this (or because of it), Jack Johnson, the first black world heavyweight champion, gave him a title shot. When they fought in Paris in August 1913, it was the first time that two black boxers had fought for the world heavyweight title. Battling Jim was the only black fighter Johnson faced during his reign as heavyweight champ from 1908 to 1915.
Document 7: Mike McCallum: Mike McCallum (born 7 December 1956) is a Jamaican former professional boxer who competed from 1981 to 1997. He is a three-weight world champion, having held the WBA super welterweight title from 1984 to 1988; the WBA middleweight title from 1989 to 1991; and the WBC light heavyweight title from 1994 to 1995.
Document 8: Virgin Islands at the 2008 Summer Olympics: The United States Virgin Islands competed in the 2008 Summer Olympics, which were held in Beijing, the People's Republic of China from August 8 to August 24, 2008. The appearance of its 23-person delegation marked its fifteenth appearance at the Olympic games, and its tenth appearance at the Summer Olympic games. In total, seven athletes participated on behalf of the Virgin Islands (Tabarie Henry and LaVerne Jones-Ferrette in track and field, John and Julius Jackson in boxing, Thomas Barrows III in sailing, Ned Gerard in shooting, and Josh Laban in swimming) in Beijing. Of those, John Jackson and Tabarie Henry progressed to a post-preliminary event, and Henry reached semifinals in his own. There were no Virgin Islander medalists at the Beijing Olympics.
Document 9: Jackson Asiku: Jackson "Action" Asiku (born October 21, 1978), is a Ugandan/Australian amateur flyweight and professional feather/super featherweight boxer of the 1990s, 2000s and 2010s who as an amateur represented Uganda and won a bronze medal at flyweight in the Boxing at the 1998 Commonwealth Games in Kuala Lumpur, Malaysia, losing to eventual gold medal winner Richard Sunee of Mauritius, represented Uganda and won a bronze medal at flyweight in the Boxing at the 1999 All-Africa Games in Johannesburg, South Africa, losing to eventual silver medal winner Nacer Keddam of Algeria, and represented Uganda at flyweight in the Boxing at the 2000 Summer Olympics in Sydney, Australia, losing to Arlan Lerio of the Philippines, and as a professional won the Australian featherweight title, World Boxing Organization (WBO) Asia Pacific featherweight title, African Boxing Union (ABU) featherweight title, International Boxing Federation (IBF) Australasian featherweight title, International Boxing Organization (IBO) featherweight title, and Commonwealth featherweight title, and was a challenger for the International Boxing Federation (IBF) Pan Pacific featherweight title against Fahprakorb Rakkiatgym, his professional fighting weight varied from 123+1/2 lb , i.e. featherweight to 129+3/4 lb , i.e. super featherweight.
Document 10: Mike Tyson: Michael Gerard Tyson ( ; born June 30, 1966) is an American former professional boxer who competed from 1985 to 2005. He reigned as the undisputed world heavyweight champion and holds the record as the youngest boxer to win a heavyweight title at 20 years, 4 months and 22 days old. Tyson won his first 19 professional fights by knockout, 12 of them in the first round. He won the WBC title in 1986 after stopping Trevor Berbick in two rounds, and added the WBA and IBF titles after defeating James Smith and Tony Tucker in 1987. This made Tyson the first heavyweight boxer to simultaneously hold the WBA, WBC and IBF titles, and the only heavyweight to successively unify them.
Document 11: Virgil Hill: Virgil Eugene Hill (born January 18, 1964) is an American former professional boxer who competed from 1984 to 2007, and in 2015. He is a two-weight world champion, having held the WBA light heavyweight title twice, from 1987 to 1997; the IBF and lineal light heavyweight titles from 1996 to 1997; and the WBA cruiserweight title twice, from 2000 to 2002 and 2006 to 2007. As an amateur, Hill won a silver medal in the middleweight division at the 1984 Summer Olympics. In 2013, he was inducted into the International Boxing Hall of Fame.
Document 12: Julius Jackson: Julius Jackson (born August 1, 1987) is a professional boxer from the Virgin Islands who qualified for the 2008 Olympics at light-heavyweight, as did his brother John Jackson. Their father is boxer Julian Jackson.
Document 13: Nigel Benn: Nigel Gregory Benn (born 22 January 1964) is a British former professional boxer who competed from 1987 to 1996. He is a two-weight world champion, having held the WBO middleweight title in 1990, and the WBC super-middleweight title from 1992 to 1996. Additionally he held the Commonwealth middleweight title from 1988 to 1989. Nicknamed "The Dark Destroyer" for his formidable punching power and aggressive fighting style, Benn is ranked by BoxRec as the fourth best British super-middleweight boxer of all time.
Document 14: John Jackson (Virgin Islands boxer): John Jackson (born January 16, 1989) is a professional boxer from the Virgin Islands who qualified for, and boxed in, the 2008 Olympics at welterweight. He is one of the sons of boxer Julian Jackson, and his brother Julius Jackson qualified at light-heavyweight.
Document 15: Roy Jones Jr.: Roy Levesta Jones Jr. (born January 16, 1969) is an American professional boxer, boxing commentator, boxing trainer, rapper, and actor who holds dual American and Russian citizenship. He is a six-time former world champion in four weight classes, having held titles at middleweight, super middleweight, light heavyweight, and heavyweight; and is the only boxer in history to start his professional career at light middleweight and go on to win a heavyweight title. As an amateur he represented the United States at the 1988 Summer Olympics, winning a silver medal in the light middleweight division.
ground_truth: U.S. Virgin Islands