Question: Which one was an American poet, Frank O'Connor or Edwin Arlington Robinson?

full_context: Document 1: Edna St. Vincent Millay: Edna St. Vincent Millay (February 22, 1892 – October 19, 1950) was an American poet and playwright. She received the Pulitzer Prize for Poetry in 1923, the third woman to win the award for poetry, and was also known for her feminist activism. She used the pseudonym Nancy Boyd for her prose work. The poet Richard Wilbur asserted, "She wrote some of the best sonnets of the century."
Document 2: Guests of the Nation: "Guests of the Nation" is a short story written by Frank O'Connor, first published in 1931, portraying the execution of two Englishmen held captive by the Irish Republican Army during the War for Independence. The story is split into four sections, each section taking a different tone. The first reveals a real sense of camaraderie between the English prisoners. With the two Englishmen being killed, the final lines of the story describe the nauseating effect this has on the Irishmen.
Document 3: Edwin Arlington Robinson: Edwin Arlington Robinson (December 22, 1869 – April 6, 1935) was an American poet who won three Pulitzer Prizes for his work. He was nominated for the Nobel Prize in Literature four times.
Document 4: Frank McCourt: Francis "Frank" McCourt (August 19, 1930July 19, 2009) was an Irish-American teacher and writer. He won a Pulitzer Prize for his book "Angela's Ashes", a tragicomic memoir of the misery and squalor of his childhood.
Document 5: Robert Frost: Robert Lee Frost (March26, 1874January29, 1963) was an American poet. His work was initially published in England before it was published in America. He is highly regarded for his realistic depictions of rural life and his command of American colloquial speech. His work frequently employed settings from rural life in New England in the early twentieth century, using them to examine complex social and philosophical themes. One of the most popular and critically respected American poets of the twentieth century, Frost was honored frequently during his lifetime, receiving four Pulitzer Prizes for Poetry. He became one of America's rare "public literary figures, almost an artistic institution." He was awarded the Congressional Gold Medal in 1960 for his poetic works. On July 22, 1961, Frost was named poet laureate of Vermont.
Document 6: Martin Malone (author): Martin Malone is an Irish novelist and short story writer. His novel, "The Broken Cedar" (2003), was nominated for the International IMPAC Dublin Literary Award and was shortlisted for an Irish Fiction Award. His first novel, "Us" (2000), won the John B Keane/Sunday Independent Award. His story, “The Mango War”, the title story of his 2009 short story collection won the RTÉ Francis MacManus Award in 2004. Malone has also won the Killarney International Short Story Prize and has been on two occasions shortlisted for both a Hennessy Award and a PJ O'Connor Award.
Document 7: Children of The Night: Children of The Night was the second volume of Poetry published by the American Poet Edwin Arlington Robinson. While the volume was weakly received President Theodore Roosevelt's son Kermit introduced the work to his father who knowing his straits secured him a job at the NY Customs Office.
Document 8: Richard Cory: "Richard Cory" is a narrative poem written by Edwin Arlington Robinson. It was first published in 1897, as part of "The Children of the Night", having been completed in July of that year; and it remains one of Robinson's most popular and anthologized poems. The poem describes a person who is wealthy, well educated, mannerly, and admired by the people in his town. Despite all this, he fatally shoots himself in the head.
Document 9: Frank O'Connor: Frank O'Connor (born Michael Francis O'Donovan; 17 September 1903 – 10 March 1966) was an Irish writer of over 150 works, best known for his short stories and memoirs. The Frank O'Connor International Short Story Award is named in his honour.
Document 10: Robert Penn Warren: Robert Penn Warren (April 24, 1905 – September 15, 1989) was an American poet, novelist, and literary critic and was one of the founders of New Criticism. He was also a charter member of the Fellowship of Southern Writers. He founded the literary journal "The Southern Review" with Cleanth Brooks in 1935. He received the 1947 Pulitzer Prize for the Novel for his novel "All the King's Men" (1946) and the Pulitzer Prize for Poetry in 1958 and 1979. He is the only person to have won Pulitzer Prizes for both fiction and poetry.
Document 11: Edwin Arlington Robinson House: The Edwin Arlington Robinson House is an historic house at 67 Lincoln Avenue in Gardiner, Maine. A relatively unprepossessing two-story wood frame house, it was designated a National Historic Landmark in 1971 for its association with Edwin Arlington Robinson (1869–1935) one the United States' leading poets of the late 19th and early 20th centuries.
Document 12: Brian O'Nolan: Brian O'Nolan (Irish: "Brian Ó Nualláin" ; 5 October 1911 – 1 April 1966) was an Irish novelist, playwright and satirist, considered a major figure in twentieth century Irish literature. Born in Strabane, County Tyrone, he is regarded as a key figure in postmodern literature. His English language novels, such as "At Swim-Two-Birds", and "The Third Policeman", were written under the "pen name" Flann O'Brien. His many satirical columns in "The Irish Times" and an Irish language novel "An Béal Bocht" were written under the name Myles na gCopaleen.
Document 13: William Trevor: William Trevor KBE (24 May 1928 – 20 November 2016) was an Irish novelist, playwright and short story writer. One of the elder statesmen of the Irish literary world, he was widely regarded as one of the greatest contemporary writers of short stories in the English language.
Document 14: Flannery O'Connor: Mary Flannery O'Connor (March 25, 1925August 3, 1964) was an American writer and essayist. She wrote two novels and thirty-two short stories, as well as a number of reviews and commentaries. She was a Southern writer who often wrote in a Southern Gothic style and relied heavily on regional settings and grotesque characters. Her writing also reflected her Roman Catholic faith and frequently examined questions of morality and ethics. Her posthumously compiled "Complete Stories" won the 1972 U.S. National Book Award for Fiction and has been the subject of enduring praise.
Document 15: Joseph O'Connor: Joseph Victor O'Connor is an Irish novelist. His 2002 historical novel "Star of the Sea" was an international number one bestseller. Before success as an author he was a journalist with the "Sunday Tribune" newspaper and "Esquire magazine". He is a regular contributor to Raidió Teilifís Éireann (RTÉ). He is a member of the Irish artists' association Aosdána.
ground_truth: Edwin Arlington Robinson