Samuel Denison "Sam" Martin (born February 7, 1983) is an American Grammy Award-winning musician, singer, songwriter and record producer.
 His song, "Want to Want Me", (released by Jason Derulo), holds the record for the most-adds in the American contemporary hit radio history.
 Martin's first song he wrote for another artist became the song, "Daylight" by Maroon 5, which peaked at number-one on the "Billboard" charts.
 His writing on "Fly Rasta", released by Ziggy Marley, led it to becoming a number-one reggae album as well as a receiving a Grammy Award.
 He rose to the public eye in 2014 for not only writing, but as a featured artist on David Guetta's with number-one singles: "Lovers on the Sun" and "Dangerous".
 His work also extends to projects with One Direction, Nick Jonas, Zedd, Flo Rida, Prince Royce, Snoop Dogg and T.I..
"For Your Country and My Country" is a World War I era song released in 1917.
 Lyrics and music were written by Irving Berlin.
 The song was published by Waterson, Berlin & Snyder, Co. of New York, New York.
 Artist Albert Wilfred Barbelle designed the sheet music cover.
 It features Uncle Sam playing a snare drum with an eagle on his shoulder.
 In the background are ships sailing, and below are troops marching.
 Above the title, it reads, "The Official Recruiting Song."
 The song was written for voice and piano, along with chords for guitar, ukulele, and banjo.
Dreams of Joy is a 2011 novel by Lisa See.
 It debuted as #1 in the New York Times list of best selling fiction.
 In this book See completes the circle she began in "Shanghai Girls".
 The former novel ends with the suicide of Pearl’s husband Sam and the shattering discovery by Joy that May is really her mother, Pearl is her aunt, and Z.G., the famous Chinese artist, is her father.
 Joy's guilt-driven journey to China to find her father and Pearl's loving pursuit are placed in the context of the tumult and suffering of Mao's China—especially in the context of the horrific famine caused by Mao's misguided Great Leap Forward.
 Frank Dikotter writes that “at least 45 million people died unnecessarily between 1958 and 1962. . . As famine spread, the very survival of an ordinary person came increasingly to depend on the ability to lie, charm, hide, steal, cheat, pilfer, forage, smuggle, trick, manipulate or otherwise outwit the state.”
 See’s novel uses Mao’s China as her background, but her story focuses on the change and growth of her main characters – Pearl, Joy, Z.G., and May.
 Susan Salter Reynolds suggests that “it’s a story with characters who enter a reader’s life, take up residence, and illuminate the myriad decisions and stories that make up human history.”
Ke Chong (Khmer: ឃុំកិះចុង ) is a commune in Bar Kaev District in northeast Cambodia.
 It contains nine villages and has a population of 2,415.
 In the 2007 commune council elections, four of its seats went to the Cambodian People's Party and one went to the Sam Rainsy Party.
 Land alienation is a problem of moderate severity in Ke Chong.
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 (See Ratanakiri Province for background information on land alienation.)
SAM 935 is a portable radiation detection and identification device.
 It uses gamma spectroscopy with room temperature NaI detectors, and QCC, Quadratic Compression Conversion, algorithms to identify multiple isotopes in realtime and below background (it subtracts the background).
 The SAM, surveillance and monitoring, is able to capture even transient phenomenon such as in portal situations because it captures spectra in short time segments and produces a response from spectra with each time segment.
 Conversely, if the SAM is in a moving vehicle, it can quickly scan an area as the vehicle moves.
 The first line responder can email the SAM 935 data report for further analysis.
Samuel Martins Torres Santiago Mira (born July 17, 1979), better known by his stage name Sam the Kid (STK), is a Portuguese rapper and producer from Lisbon, Portugal.
Sam Abell (born 1945 in Sylvania, Ohio) is an American photographer known for his frequent publication of photographs in "National Geographic".
 He first worked for "National Geographic" in 1967, and is one of the more overtly artistic photographers among his magazine peers.
 Sam Abell's style of photography is documentary in the sense that his major avenue, the "National Geographic" magazine, is a publication of record.
 However, his best work is known for its transcendent qualities, starting at the documentary level yet open to interpretation on an aesthetic level.
 One of his favorite photographs (based on how often he mentions it when asked about his work) is of the tree viewed through a Japanese window, which graces the cover of his book "Seeing Gardens".
 It's a documentary photograph of a tree, but due to a combination of light and Abell's inclusion in his composition of roof tiles in the background, the photograph takes on the transcendent, illusory quality of a stained glass window.
 Abell rarely uses flash, preferring a pure relationship with light.
 He has said that he could be perfectly happy with his photography even if his only subject was light itself.
Clifford Joseph Harris Jr. (born September 25, 1980), known professionally as T.I. and Tip (often stylized as TIP or T.I.P.), is an American rapper and actor from Atlanta, Georgia.
 Harris signed his first major-label record deal in 1999, with Arista subsidiary LaFace.
 In 2001, Harris formed the Southern hip hop group P$C, alongside his longtime friends and fellow Atlanta-based rappers.
 Upon being released from Arista, Harris signed to Atlantic and subsequently became the co-chief executive officer (CEO) of his own label imprint, Grand Hustle Records, which he launched in 2003.
 Harris is also perhaps best known as one of the artists who popularized the hip hop subgenre trap music, along with Young Jeezy and Gucci Mane.
'"Hello Central!
 Give Me No Man's Land" is a World War I era song released in 1918.
 Lyrics were written by Sam M. Lewis and Joe Young.
 Jean Schwartz composed the music.
 The song was published by Waterson Berlin & Snyder, Co. of New York City.
 Artist Albert Wilfred Barbelle designed the sheet music cover, which features a photo of Al Jolson next to a shadow of a child on the phone.
 Explosions in No Man's Land take up the rest of the red background.
 The song was written for both voice and piano.
 It was first introduced in the 1918 musical "Sinbad".
Music Box is the second album released by R&B singer Evelyn "Champagne" King on the RCA label in 1979.
 It was produced by Theodore Life, Bill Greene, and Sam Peake.
 It's also noted for featuring Luther Vandross on background vocals.

Question: what are T.I. and Sam Martins ethinic background?
Answer: American