Question: Are Larry McMurtry and Sally Beauman both American writers?

Context articles: Streets of Laredo (miniseries)
The Berrybender Narratives
Spur Award
Sally Beauman
Rebecca's Tale
Larry McMurtry
The Landscape of Love
Dead Man's Walk
Thalia, Texas
Diana Ossana

Larry McMurtry's Streets of Laredo is a 1995 American Western television miniseries directed by Joseph Sargent.
 It is a three-part adaptation of the 1993 novel of the same name by author Larry McMurtry and is the third installment in the Lonesome Dove series serving as a direct sequel to "Lonesome Dove" (1989), ignoring the events of "Return to Lonesome Dove" (1993).
The Berrybender Narratives is a series of novels written by Larry McMurtry.
 It tells the story of an ill-fated hunting expedition lasting several years and covering much of the early American West.
 As with much of McMurtry's Western fiction, it weaves a tale of bloody adventure with a sort of ghastly dark humor.
Spur Awards are literary prizes awarded annually by the Western Writers of America (WWA).
 The purpose of the Spur Awards is to honor writers for distinguished writing about the American West.
 The Spur awards began in 1953, the same year the WWA was founded.
 An author need not be a member of the WWA to receive a Spur Award.
 Among previous Spur Award winners are Larry McMurtry for "Lonesome Dove", Michael Blake for "Dances with Wolves", Glendon Swarthout for "The Shootist", and Tony Hillerman for "Skinwalkers".
Sally Vanessa Beauman (née Kinsey-Miles, 25 July 1944 – 7 July 2016) was an English journalist and writer, author of eight widely translated and best-selling novels.
Rebecca's Tale is a 2001 novel by British author Sally Beauman.
 The book is a sequel to the Daphne du Maurier novel "Rebecca" and is officially approved by the Du Maurier estate.
 It continues the original plot and is also roughly consistent with the 1993 sequel "Mrs de Winter" by Susan Hill.
Larry Jeff McMurtry (born June 3, 1936) is an American novelist, essayist, bookseller, and screenwriter whose work is predominantly set in either the old West or in contemporary Texas.
 His novels include "Horseman, Pass By" (1962), "The Last Picture Show" (1966) and "Terms of Endearment" (1975), which were adapted into films earning 26 Academy Award nominations (10 wins).
 His 1985 Pulitzer Prize-winning novel "Lonesome Dove" was adapted into a television miniseries that earned 18 Emmy Award nominations (seven wins), with the other three novels in his "Lonesome Dove" series adapted into three more miniseries, earning eight more Emmy nominations.
 McMurtry and cowriter Diana Ossana adapted the screenplay for "Brokeback Mountain" (2005), which earned eight Academy Award nominations with three wins, including McMurtry and Ossana for Best Adapted Screenplay.
The Landscape of Love (The Sisters Mortland in the US edition) is a novel published by British author Sally Beauman.
 It tells the tale of the Mortland girls – beautiful, but cold, Julia; remote and aloof Finn; and young ‘different’ Maisie – who come with their mother, Stella, to live in their grandfather's home, a huge and ancient ruin of an abbey.
Dead Man's Walk is a 1995 novel by Larry McMurtry.
 It is the third book published in the "Lonesome Dove" series but the first installment in terms of chronology.
 McMurtry wrote a fourth segment to the "Lonesome Dove" chronicle, "Comanche Moon", which describes the events of the central characters' lives between "Dead Man's Walk" and "Lonesome Dove".
 The second novel in the "Lonesome Dove" series was the 1993 sequel to the original, called "Streets of Laredo".
 It was later screened in May 1996 as a three-part miniseries of the same name.
Thalia is an unincorporated community in Foard County in the northern part of the U.S. state of Texas.
 In 1990, the population was 104.
 Its name was given to the town portrayed in a number of Larry McMurtry's novels, including his first novel, "Horseman, Pass By" (1961).
 Mcmurtry's "Thalia" is widely considered to be modeled on his own North Texas hometown of Archer City, about 60 miles from Thalia.
Diana Lynn Ossana is an American writer who has collaborated on writing screenplays, teleplays, and novels with author Larry McMurtry since they first worked together in 1992, on the semi-fictionalized biography "Pretty Boy Floyd".
 She won a Best Adapted Screenplay Oscar or Academy Award, a Writers' Guild of America Award, a BAFTA Award and a Golden Globe Award for her screenplay of Ang Lee's "Brokeback Mountain", along with McMurthy and adapted from the short story of the same name by Annie Proulx.
 She is a published author in her own right of several short stories and essays.