Question: A Spool of Blue Thread is a novel by the literary critic of what nationality?
Context: Thread seal tape (also known as PTFE tape or plumber's tape) is a polytetrafluoroethylene (PTFE) film for use in sealing pipe threads.  The tape is sold cut to specific widths and wound on a spool, making it easy to wind around pipe threads.  It is also known by the genericised trade-name Teflon tape; while Teflon is in fact identical to PTFE, Chemours (the trade-mark holders) consider this usage incorrect, especially as they no longer manufacture Teflon in tape form.  Thread seal tape lubricates allowing for a deeper seating of the threads, and it helps prevent the threads from seizing when being unscrewed.  The tape also works as a deformable filler and thread lubricant, helping to seal the joint without hardening or making it more difficult to tighten, and instead making it easier to tighten. A Spool of Blue Thread, published in 2015, is Anne Tyler’s 20th novel. 1634: The Ram Rebellion is the seventh published work in the 1632 alternate history book series, and is the third work to establish what is best considered as a "main plot line or thread" of historical speculative focus that are loosely organized and classified geographically.  The initial "main thread" is called the "Western and North-Central Europe thread" (encompassing northern and western Germany, Denmark, England, France, the Low Countries, Sweden and the Baltic); the second plot line, encompassing events in Italy, Spain, the Mediterranean region, and France, the "South European thread", and this book can be considered the starting novel of the "South-Central/South-East thread" being set in southern Germany, Austria, Bavaria, and Bohemia.  This geographically organized plot thread actually began in "Ring of Fire" in Flint's novelette "The Wallenstein Gambit" which is set in Bohemia, Austria, and Germany, which tied into stories in various Grantville Gazettes. Izabela Sadoveanu-Evan (] , last name also Sadoveanu-Andrei, first name also Isabella or Izabella; born Izabela Morțun, pen names I.Z.S.D. and Iz.  Sd.; February 24, 1870 – August 6, 1941) was a Romanian literary critic, educationist, opinion journalist, poet and feminist militant.  She spent her youth advocating socialism, and rallied with left-wing politics for the remainder of her life, primarily as a representative of Poporanist circles and personal friend of culture critic Garabet Ibrăileanu.  Under Ibrăileanu's guidance, Sadoveanu wrote for "Viața Românească" review, where she tried to reconcile ethnic nationalism and traditionalism with aestheticism.  As literary critic, she championed the recognition of Symbolism as an independent cultural phenomenon, and reviewed modern developments in English literature. Taeko Kōno (河野 多惠子 , Kōno Taeko , February 24, 1926 – January 29, 2015) is one of the most important Japanese women writers of the second half of the twentieth century, someone whose influence on contemporary Japanese women writers is acknowledged to be immeasurable.  Kōno is one of a generation of remarkable women writers who made an appearance in Japan in the 1960s and 1970s and who include Kurahashi Yumiko, Mori Mari, Setouchi Harumi, and Takahashi Takako (Japanese name order).  She also established a reputation for herself as an acerbic essayist, a playwright and a literary critic.  By the end of her life she was a leading presence in Japan's literary establishment, one of the first women writers to serve on the Akutagawa Literary Prize committee.  Oe Kenzaburo, Japan's Nobel Laureate, described her as the most "lucidly intelligent" woman writers writing in Japan, and the US critic and academic Masao Miyoshi identified her as among the most "critically alert and historically intelligent."  US critic and academic Davinder Bhowmik assesses her as “…one of the truly original voices of the twentieth century, beyond questions of gender or even nationality.”  A writer who deals with some quite dark themes, Kōno is known to readers in English through the collection of short stories "Toddler-Hunting and Other Stories" (New Directions, 1996), which draws together her best writing from the 1960s. Willy Dahl (born 26 March 1927) is a Norwegian literary researcher and literary critic.  He was a professor at the University of Trondheim from 1978, and at the University of Bergen from 1981 to 1992.  He has written several books on literary history.  He has been a literary critic for the newspaper "Arbeiderbladet". Clemens Petersen (2 October 1834 – 21 May 1918) was a Danish esthetician, theatre critic and literary critic.  He was born in the parish Asminderup in Odsherred, Zealand.  In his position as theatre critic and literary critic for "Fædrelandet" he had a significant influence on public opinion, and is also credited for helping the approval of Bjørnstjerne Bjørnson in Denmark.  Among his publications is "Dramaturgisk Kritik" from 1860, and "Forholdet mellem det gamle og det ny ved Oehlenschläger’s Fremtræden" (1867).  Petersen left Denmark in 1868 and settled in North America.  He contributed to various periodica, including "Heimdal" (Chicago) and "Nordlyset" (New York).  He returned to Denmark in 1904, and died in Copenhagen in 1918. Benedito Nunes (November 21, 1929 - February 27, 2011) was a Brazilian philosopher and literary critic.  He was born Benedito José Viana da Costa Nunes in Belém, a major city in the north of Brazil, where he was a professor at the Federal University of Pará.  He has also lectured at other universities in the south of Brazil, France and the United States.  In 1987, he was awarded the Prêmio Jabuti, regarded as the most prestigious literary prize in Brazil.  He was awarded again with the same prize in 2010, for the literary critic "A Clave do Poético".  He was one of the most respected authorities in contemporary Brazilian culture, and a specialist in the literary work of Brazilian modernists such as Clarice Lispector.  Benedito Nunes died in his hometown Belém on February 27, 2011. Anne Tyler (born October 25, 1941) is an American novelist, short story writer, and literary critic.  She has published 20 novels, the best known of which are "Dinner at the Homesick Restaurant" (1982), "The Accidental Tourist" (1985), and "Breathing Lessons" (1988).  All three were finalists for the Pulitzer Prize for Fiction with "Breathing Lessons" winning the prize for 1989.  She has also won the Janet Heidinger Kafka Prize, the Ambassador Book Award, and the National Book Critics Circle Award.  In 2012 she was awarded "The Sunday Times" Award for Literary Excellence.  She is recognized for her fully developed characters, her “brilliantly imagined and absolutely accurate detail,” and her “rigorous and artful style” and “astute and open language.”  While many of her characters have been described as quirky or eccentric, she has managed to make them seem real through skillfully fleshing out their inner lives in great depth.  Her subject in all her novels has been the American family and marriage: the boredom and exasperating irritants endured by partners, children, siblings, parents; the desire for freedom pulling against the tethers of attachments and conflicted love; the evolution over time of familial love and sense of duty.  Tyler celebrates unremarkable Americans and the ordinary details of their everyday lives.  Because of her style and subject matter, she has been compared to John Updike, to Jane Austen, and to Eudora Welty, among others. Dame Cicely Isabel Fairfield DBE (21 December 1892 – 15 March 1983), known as Rebecca West, or Dame Rebecca West, was a British author, journalist, literary critic and travel writer.  An author who wrote in many genres, West reviewed books for "The Times", the "New York Herald Tribune", the "Sunday Telegraph", and the "New Republic", and she was a correspondent for "The Bookman".  Her major works include "Black Lamb and Grey Falcon" (1941), on the history and culture of Yugoslavia; "A Train of Powder" (1955), her coverage of the Nuremberg trials, published originally in "The New Yorker"; "The Meaning of Treason", later "The New Meaning of Treason", a study of the trial of the British Fascist William Joyce and others; "The Return of the Soldier", a modernist World War I novel; and the "Aubrey trilogy" of autobiographical novels, "The Fountain Overflows", "This Real Night", and "Cousin Rosamund". " Time" called her "indisputably the world's number one woman writer" in 1947.  She was made CBE in 1949, and DBE in 1959, in each case, the citation reads: "writer and literary critic".  She took the pseudonym "Rebecca West" from the rebellious young heroine in "Rosmersholm" by Henrik Ibsen.
Answer: American