Question: Why is there one star on the flag of the country where the groups not from the U.S. came from in The Sing-Off?

full_context: Document 1: A cappella: In July 1943, as a result of the American Federation of Musicians boycott of US recording studios, the a cappella vocal group The Song Spinners had a best-seller with "Comin' In On A Wing And A Prayer". In the 1950s several recording groups, notably The Hi-Los and the Four Freshmen, introduced complex jazz harmonies to a cappella performances. The King's Singers are credited with promoting interest in small-group a cappella performances in the 1960s. In 1983 an a cappella group known as The Flying Pickets had a Christmas 'number one' in the UK with a cover of Yazoo's (known in the US as Yaz) "Only You". A cappella music attained renewed prominence from the late 1980s onward, spurred by the success of Top 40 recordings by artists such as The Manhattan Transfer, Bobby McFerrin, Huey Lewis and the News, All-4-One, The Nylons, Backstreet Boys and Boyz II Men.[citation needed]
Document 2: Flag of Argentina: The flag of Argentina is a triband, composed of three equally wide horizontal bands coloured baby blue and white. There are multiple interpretations on the reasons for those colors. The flag was created by Manuel Belgrano, in line with the creation of the Cockade of Argentina, and was first raised at the city of Rosario on February 27, 1812, during the Argentine War of Independence. The National Flag Memorial was later built on the site. The First Triumvirate did not approve the use of the flag, but the Asamblea del Año XIII allowed the use of the flag as a war flag. It was the Congress of Tucumán which finally designated it as the national flag, in 1816. A yellow Sun of May was added to the center in 1818.
Document 3: Flag of Puerto Rico: In a letter written by Maria Manuela (Mima) Besosa, the daughter of the Puerto Rican Revolutionary Committee member Manuel Besosa, she stated that she sewed the flag. This created a belief that her father could have been its designer. In her letter she described the flag as one which consists of five stripes that alternate from red to white. Three of the stripes are red, and the other two are white. To the left of the flag is a light blue triangle that houses one white five - pointed star. Each part of this flag has its own meaning. The three red stripes represent the blood from the brave warriors. The two white stripes represent the victory and peace that they would have after gaining independence. The white star represented the island of Puerto Rico. The blue represents the sky and blue coastal waters. The triangle represents the three branches of government. Finally, it is also believed by some that it was Lola Rodríguez de Tió who suggested that Puerto Ricans use the Cuban flag with its colors reversed as the model for their own standard. The color of the Cuban flag's blue stripes, however, were a darker shade of blue, according to Professor Martí.
Document 4: Flag of the United States: The flag of the United States of America, often referred to as the American flag, is the national flag of the United States. It consists of thirteen equal horizontal stripes of red (top and bottom) alternating with white, with a blue rectangle in the canton (referred to specifically as the ``union '') bearing fifty small, white, five - pointed stars arranged in nine offset horizontal rows, where rows of six stars (top and bottom) alternate with rows of five stars. The 50 stars on the flag represent the 50 states of the United States of America, and the 13 stripes represent the thirteen British colonies that declared independence from the Kingdom of Great Britain, and became the first states in the U.S. Nicknames for the flag include the Stars and Stripes, Old Glory, and the Star - Spangled Banner.
Document 5: Flag of Palestine: The Palestinian flag (Arabic: علم فلسطين ‎ ‎) is a tricolor of three equal horizontal stripes (black, white, and green from top to bottom) overlaid by a red triangle issuing from the hoist. This flag is derived from the Pan-Arab colors and it is used to represent the State of Palestine and the Palestinian people.
Document 6: A cappella: Contemporary a cappella includes many vocal groups and bands who add vocal percussion or beatboxing to create a pop/rock/gospel sound, in some cases very similar to bands with instruments. Examples of such professional groups include Straight No Chaser, Pentatonix, The House Jacks, Rockapella, Mosaic, and M-pact. There also remains a strong a cappella presence within Christian music, as some denominations purposefully do not use instruments during worship. Examples of such groups are Take 6, Glad and Acappella. Arrangements of popular music for small a cappella ensembles typically include one voice singing the lead melody, one singing a rhythmic bass line, and the remaining voices contributing chordal or polyphonic accompaniment.
Document 7: Grammy Award for Best Contemporary Performance by a Chorus: The Grammy Award for Best Contemporary Performance by a Chorus was awarded in 1969 (as Best Contemporary Pop Performance, Chorus) and in 1970. In some years, the Grammy Award for Best Pop Performance by a Duo or Group with Vocal also included performances by a chorus.
Document 8: Flag of Puerto Rico: Juan de Mata Terreforte, an exiled veteran of ``El Grito de Lares ''and Vice-President of the Cuban Revolutionary Committee, in New York City, adopted the flag of Lares as the flag of Puerto Rico until 1895, when the current design, modeled after the Cuban flag, was unveiled and adopted by the 59 Puerto Rican exiles of the Cuban Revolutionary committee. The new flag, which consisted of five equal horizontal bands of red (top and bottom) alternating with white; a blue isosceles triangle based on the hoist side bears a large, white, five - pointed star in the center, was first flown in Puerto Rico on March 24, 1897, during the`` Intentona de Yauco'' revolt. The use and display of the Puerto Rican flag was outlawed and the only flags permitted to be flown in Puerto Rico were the Spanish flag (1492 to 1898) and the flag of the United States (1898 to 1952).
Document 9: A cappella: Barbershop music is one of several uniquely American art forms. The earliest reports of this style of a cappella music involved African Americans. The earliest documented quartets all began in barbershops. In 1938, the first formal men's barbershop organization was formed, known as the Society for the Preservation and Encouragement of Barber Shop Quartet Singing in America (S.P.E.B.S.Q.S.A), and in 2004 rebranded itself and officially changed its public name to the Barbershop Harmony Society (BHS). Today the BHS has over 22,000 members in approximately 800 chapters across the United States, and the barbershop style has spread around the world with organizations in many other countries. The Barbershop Harmony Society provides a highly organized competition structure for a cappella quartets and choruses singing in the barbershop style.
Document 10: A cappella: Increased interest in modern a cappella (particularly collegiate a cappella) can be seen in the growth of awards such as the Contemporary A Cappella Recording Awards (overseen by the Contemporary A Cappella Society) and competitions such as the International Championship of Collegiate A Cappella for college groups and the Harmony Sweepstakes for all groups. In December 2009, a new television competition series called The Sing-Off aired on NBC. The show featured eight a cappella groups from the United States and Puerto Rico vying for the prize of $100,000 and a recording contract with Epic Records/Sony Music. The show was judged by Ben Folds, Shawn Stockman, and Nicole Scherzinger and was won by an all-male group from Puerto Rico called Nota. The show returned for a second and third season, won by Committed and Pentatonix, respectively.
Document 11: Washington University in St. Louis: Washington University has a large number of student-run musical groups on campus, including 12 official a cappella groups. The Pikers, an all-male group, is the oldest such group on campus. The Greenleafs, an all-female group is the oldest (and only) female group on campus. The Mosaic Whispers, founded in 1991, is the oldest co-ed group on campus. They have produced 9 albums and have appeared on a number of compilation albums, including Ben Folds' Ben Folds Presents: University A Cappella! The Amateurs, who also appeared on this album, is another co-ed a cappella group on campus, founded in 1991. They have recorded seven albums and toured extensively. After Dark is a co-ed a cappella group founded in 2001. It has released three albums and has won several Contemporary A Capella Recording (CARA) awards. In 2008 the group performed on MSNBC during coverage of the vice presidential debate with specially written songs about Joe Biden and Sarah Palin. The Ghost Lights, founded in 2010, is the campus's newest and only Broadway, Movies, and Television soundtrack group. They have performed multiple philanthropic concerts in the greater St. Louis area and were honored in November 2010 with the opportunity to perform for Nobel Laureate Douglass North at his birthday celebration.
Document 12: Flag of the United States: The flag of the United States of America, often referred to as the American flag, is the national flag of the United States. It consists of thirteen equal horizontal stripes of red (top and bottom) alternating with white, with a blue rectangle in the canton (referred to specifically as the ``union '') bearing fifty small, white, five - pointed stars arranged in nine offset horizontal rows, where rows of six stars (top and bottom) alternate with rows of five stars. The 50 stars on the flag represent the 50 states of the United States of America, and the 13 stripes represent the thirteen British colonies that declared independence from the Kingdom of Great Britain, and became the first states in the U.S. Nicknames for the flag include The Stars and Stripes, Old Glory, and The Star - Spangled Banner.
Document 13: Flag of Chile: The flag of Chile consists of two equal horizontal bands of white and red, with a blue square the same height as the white band in the canton, which bears a white five - pointed star in the center. It was adopted on 18 October 1817. The Chilean flag is also known in Spanish as La Estrella Solitaria (The Lone Star).
Document 14: Red White and Blue: any Tricolour flag or banner having the three colors of red, white and blue (38 total): The flag of Australia The flag of Cambodia The flag of Chile The flag of the Cook Islands The flag of Costa Rica The flag of Croatia The flag of Cuba The flag of the Czech Republic The flag of the Dominican Republic The flag of the Faroe Islands The flag of France The flag of Haiti The flag of Iceland The flag of North Korea The flag of South Korea The flag of Laos The flag of Liberia The flag of Luxembourg The flag of Malaysia The flag of Nepal The flag of the Netherlands The flag of New Zealand The flag of Norway The flag of Panama The flag of Paraguay The flag of the Philippines The flag of Puerto Rico The flag of Russia The flag of Samoa The flag of Schleswig - Holstein The flag of Serbia The flag of Sint Maarten The flag of Slovakia The flag of Slovenia The flag of Taiwan The flag of Thailand The Union Jack of the United Kingdom The flag of the United States
Document 15: A cappella: A cappella is gaining popularity among South Asians with the emergence of primarily Hindi-English College groups. The first South Asian a cappella group was Penn Masala, founded in 1996 at the University of Pennsylvania. Co-ed South Asian a cappella groups are also gaining in popularity. The first co-ed south Asian a cappella was Anokha, from the University of Maryland, formed in 2001. Also, Dil se, another co-ed a cappella from UC Berkeley, hosts the "Anahat" competition at the University of California, Berkeley annually. Maize Mirchi, the co-ed a cappella group from the University of Michigan hosts "Sa Re Ga Ma Pella", an annual South Asian a cappella invitational with various groups from the Midwest.
ground_truth: represented the island of Puerto Rico
sub_queries: In The Sing-Off, where did the groups not from the United States come from? Answer: Puerto Rico
why does the Puerto Rico flag have one star Answer: represented the island of Puerto Rico