Question: Sako Shahinian and Arshile Gorky, are of which mutual nationality?

full_context: Document 1: System of a Down: System of a Down, sometimes shortened to System and abbreviated as SOAD, is an Armenian-American heavy metal band from Glendale, California, formed in 1994. The band currently consists of Serj Tankian (lead vocals, keyboards), Daron Malakian (vocals, guitar), Shavo Odadjian (bass, backing vocals) and John Dolmayan (drums).
Document 2: De Kooning: An American Master: de Kooning: An American Master is a biography of Dutch American painter Willem de Kooning, a prominent figure in the American movement of abstract expressionism in the thirties and forties. Often compared to Jackson Pollock and Arshile Gorky, de Kooning was considered one of the more inspirational and influential artists of the 20th century. The book, which is the first comprehensive biography presenting both de Kooning's personal life and career, was written by authors by Mark Stevens and Annalyn Swan. In 2005, the book was honored with the 2005 Pulitzer Prize for Biography or Autobiography.
Document 3: Serart: Serart is a collaboration album by two international Armenian musicians: Serj Tankian ("Ser-"), lead singer of System of a Down, and folk multi-instrumentalist Arto Tunçboyacıyan ("-art"). It was the first release on Tankian's own label, Serjical Strike Records.
Document 4: Ethel Schwabacher: Ethel Kremer Schwabacher (born May 20, 1903, New York, New York, U.S.— died November 25, 1984, New York, New York, U.S.) was an abstract expressionist painter, represented by the Betty Parsons Gallery in the 1950s and 1960s. She was a protégé and first biographer of Arshile Gorky, and friends with many of the prominent painters of New York at that time, including Willem de Kooning, Richard Pousette-Dart, Kenzo Okada, and José Guerrero. She was also the author of a monograph on the artist John Ford and a memoir, "Hungry for Light".
Document 5: Shavo Odadjian: Shavarsh "Shavo" Odadjian (Armenian: Շավարշ "Շավո" Օդաջյան ; born April 22, 1974) is an Armenian American songwriter, multi-instrumentalist, music video director/editor, music producer, and artist/painter. He is best known as the bassist, backing vocalist and occasional songwriter of the Grammy Award-winning metal band System of a Down. During the band's hiatus from 2006 to 2010, Odadjian collaborated with Wu-Tang Clan founder RZA on a project called AcHoZeN, which contributed a number of songs to the motion picture "Babylon A.D." A compilation album was released in 2015. Odadjian is also credited with the musical scoring of the film, alongside The Rza and Hans Zimmer. He originally used Gibson Thunderbird basses, a Fender Jazz Bass, an Ibanez BTB bass guitar, and a Music Man StingRay, but has since moved on to Warwick basses.
Document 6: Robert Coates (critic): Robert Myron Coates (April 6, 1897 – February 8, 1973) was an American writer and a long-term art critic for the "New Yorker". He coined the term "abstract expressionism" in 1946 in reference to the works of Arshile Gorky, Jackson Pollock and Willem de Kooning.
Document 7: Clement Greenberg: Clement Greenberg ( ), occasionally writing under the pseudonym K. Hardesh (January 16, 1909 – May 7, 1994), was an American essayist known mainly as an influential visual art critic closely associated with American Modern art of the mid-20th century. In particular, he is best remembered for his promotion of the abstract expressionist movement and was among the first published critics to praise the work of painter Jackson Pollock.
Document 8: Sako Shahinian: Sako Shahinian (Armenian: Սաքո Շահինյան ; born 1980) is an American-Armenian illustrator whose artwork has been featured in System of a Down projects.
Document 9: Vartan Malakian: Vartan Malakian (Armenian: Վարդան Մալաքյան, born February 14, 1947) is an artist and painter. He is the father of Daron Malakian, guitarist co-founder of System of a Down and Scars on Broadway. He was born on February 14, 1947 in Mosul, Iraq.
Document 10: Ashot Melkonian: Ashot Melkonian (Armenian: Աշոտ Անատոլիի Մելքոնյան ; March 1, 1930 – December 9, 2009) was an Armenian artist associated with Neorealistic artistic style and Honorary Artist of the Republic of Armenia. He mainly devoted himself to landscape and portraits painting, as well as murals. He is one of the founders of Neorealism in Armenian art. Art critic Shahen Khachatrian referred to Melkonian as "an artist of the generation of the 1960s that provided a new impetus to the development of Armenian art. Reality is a characteristic feature of Ashot's art". Honorary artist of Armenia Hakob Hakobian referring to Melkonian wrote "a brilliant composer of scenes, an author of exquisite portraits and landscapes, a maseter of gentlest and subtlest painting ... Melkonian is the pride of our painting school."
Document 11: Mark Rothko Art Centre: Mark Rothko Art Centre (DMRAC) is a multi-functional institution of culture, arts and education, located inside of the fortress' Arsenal building in Daugavpils, Latvia. It is a unique place in the Eastern Europe, where the original paintings of Mark Rothko are located. He was one of the great artists of the 20th century, a founder of the abstract expressionism movement, best known for his enigmatic color field paintings.
Document 12: Armenian Genocide: The Armenian Genocide (Armenian: Հայոց ցեղասպանություն , "Hayots tseghaspanutyun"), also known as the Armenian Holocaust, was the Ottoman government's systematic extermination of 1.5 million Armenians, mostly Ottoman citizens within the Ottoman Empire and its successor state, the Republic of Turkey. The starting date is conventionally held to be 24 April 1915, the day that Ottoman authorities rounded up, arrested, and deported 235 to 270 Armenian intellectuals and community leaders from Constantinople to the region of Ankara, the majority of whom were eventually murdered. The genocide was carried out during and after World War I and implemented in two phases—the wholesale killing of the able-bodied male population through massacre and subjection of army conscripts to forced labour, followed by the deportation of women, children, the elderly, and the infirm on death marches leading to the Syrian Desert. Driven forward by military escorts, the deportees were deprived of food and water and subjected to periodic robbery, rape, and massacre. Other indigenous and Christian ethnic groups, such as the Assyrians and the Ottoman Greeks, were similarly targeted for extermination by the Ottoman government in the Assyrian genocide and the Greek genocide, and their treatment is considered by some historians to be part of the same genocidal policy. Most Armenian diaspora communities around the world came into being as a direct result of the genocide.
Document 13: Arshile Gorky: Arshile Gorky ( ; born Vostanik Manoug Adoian, Armenian: Ոստանիկ Մանուկ Ատոյեան ; April 15, 1904 – July 21, 1948) was an Armenian-American painter, who had a seminal influence on Abstract Expressionism. He spent most his life as a national of the United States. Along with Mark Rothko, Jackson Pollock and Willem de Kooning, Gorky has been hailed as one of the most powerful American painters of the 20th century. As such, his works were often speculated to have been informed by the suffering and loss he experienced in the Armenian Genocide.
Document 14: Shahen Khachatrian: Shahen Gevorki Khachatryan (born September 28, 1934, Aleppo) is an Armenian art expert. He is the founding director of the Arshile Gorky Museum in Etchmiadzin.
Document 15: Serj Tankian: Serj Tankian (Western Armenian: Սերժ Թանկեան , ] ; born August 21, 1967) is a Lebanese-born Armenian-American singer-songwriter, composer, multi-instrumentalist, record producer, poet, and political activist with Armenian descent. He is best known as the lead vocalist, songwriter, keyboardist, and occasional live rhythm guitarist of the metal band System of a Down, formed in 1994.
ground_truth: American-Armenian