Question: When was the country of which Kristina Lennox-Silva is a national declared a US territory?

full_context: Document 1: Diana López: Diana López (born January 7, 1984) is an American Olympic Taekwondo competitor from Sugar Land, Texas. She represented the United States at the 2008 Olympics in Beijing, where she won a bronze medal.
Document 2: Puerto Rico: In 1917, the U.S. Congress passed the Jones -- Shafroth Act, popularly called the Jones Act, which granted Puerto Ricans, born on or after, April 25, 1898, U.S. citizenship. Opponents, which included all of the Puerto Rican House of Delegates, who voted unanimously against it, said that the U.S. imposed citizenship in order to draft Puerto Rican men into the army as American entry into World War I became likely.
Document 3: Puerto Rico: Originally populated by the indigenous Taíno people, the island was claimed in 1493 by Christopher Columbus for Spain during his second voyage. Later it endured invasion attempts from the French, Dutch, and British. Four centuries of Spanish colonial government influenced the island's cultural landscapes with waves of African slaves, Canarian, and Andalusian settlers. In the Spanish Empire, Puerto Rico played a secondary, but strategic role when compared to wealthier colonies like Peru and the mainland parts of New Spain. Spain's distant administrative control continued up to the end of the 19th century, helping to produce a distinctive creole Hispanic culture and language that combined elements from the Native Americans, Africans, and Iberians. In 1898, following the Spanish -- American War, the United States acquired Puerto Rico under the terms of the Treaty of Paris. The treaty took effect on April 11, 1899.
Document 4: Gina Rodriguez: Gina Alexis Rodriguez was born in Chicago, Illinois, the youngest daughter of Puerto Rican parents: Magali and Genaro Rodríguez, a boxing referee. She is the youngest of three sisters. She was raised in the Belmont Cragin neighborhood on Chicago's Northwest Side. At the age of seven, Rodriguez performed at the salsa dance company Fantasia Juvenil. Rodriguez was raised Catholic, and attended high school at St. Ignatius College Prep. She continued dancing salsa until age 17.
Document 5: 51st state: Puerto Rico is designated in its constitution as the "Commonwealth of Puerto Rico". The Constitution of Puerto Rico which became effective in 1952 adopted the name of Estado Libre Asociado (literally translated as "Free Associated State"), officially translated into English as Commonwealth, for its body politic. The island is under the jurisdiction of the Territorial Clause of the U.S. Constitution, which has led to doubts about the finality of the Commonwealth status for Puerto Rico. In addition, all people born in Puerto Rico become citizens of the U.S. at birth (under provisions of the Jones–Shafroth Act in 1917), but citizens residing in Puerto Rico cannot vote for president nor for full members of either house of Congress. Statehood would grant island residents full voting rights at the Federal level. The Puerto Rico Democracy Act (H.R. 2499) was approved on April 29, 2010, by the United States House of Representatives 223–169, but was not approved by the Senate before the end of the 111th Congress. It would have provided for a federally sanctioned self-determination process for the people of Puerto Rico. This act would provide for referendums to be held in Puerto Rico to determine the island's ultimate political status. It had also been introduced in 2007.
Document 6: Puerto Rico: Originally populated by the indigenous Taíno people, the island was claimed in 1493 by Christopher Columbus for the Crown of Castile during his second voyage. Later it endured invasion attempts from the French, Dutch, and British. Four centuries of Spanish colonial government transformed the island's ethnic, cultural and physical landscapes primarily with waves of African slaves, Canarian, and Andalusian settlers. In the Spanish imperial imagination, Puerto Rico played a secondary, but strategic role when compared to wealthier colonies like Peru and the mainland parts of New Spain. Spain's distant administrative control continued up to the end of the 19th century, helping to produce a distinctive creole Hispanic culture and language that combined elements from the Native Americans, Africans, and Iberians. In 1898, following the Spanish -- American War, the United States acquired Puerto Rico under the terms of the Treaty of Paris.
Document 7: Isabela Moraes: Isabela Moraes (born 5 April 1980) is a former synchronized swimmer from Brazil. She competed in the women's duet competition with her twin sister, Carolina Moraes, at both the and . Both also competed for Ohio State University, winning 11 national championships, including the team routine title in 2000, and four straight titles in duet and trio routines between 1999 and 2002. Following the Olympics, Carolina and Isabela retired and joined Cirque du Soleil, with their first performance being as part of the 2005 World Aquatics Championships opening ceremony. Isabela has been since 2007 part of "Le Rêve", a show presented in Las Vegas.
Document 8: History of Puerto Rico: In 1898, during the Spanish -- American War, Puerto Rico was invaded and subsequently became a possession of the United States. The first years of the 20th century were marked by the struggle to obtain greater democratic rights from the United States. The Foraker Act of 1900, which established a civil government, and the Jones Act of 1917, which made Puerto Ricans U.S. citizens, paved the way for the drafting of Puerto Rico's Constitution and its approval by Congress and Puerto Rican voters in 1952. However, the political status of Puerto Rico, a Commonwealth controlled by the United States, remains an anomaly.
Document 9: Kristen Graczyk: Kristen Marie Graczyk (born June 27, 1983, in Albuquerque, New Mexico) is an American former soccer forward and defender who played for FC Gold Pride of Women's Professional Soccer. Her brother, Mike Graczyk, is a goalkeeper and played for San Jose Earthquakes in Major League Soccer.
Document 10: Jaclyn Pangilinan: Jaclyn Pangilinan (born May 29, 1986) is a Filipino-American former swimmer, who specialized in breaststroke events. She is a two-time Filipino record holder, a four-time Ivy League champion (2005, 2006, and 2008) in the 100 and 200 m breaststroke, and a multiple-time medalist at the Southeast Asian Games (2005 and 2007). Born to a Filipino father, and an American mother, Pangilinan holds a dual citizenship to compete collegiately and internationally in swimming.
Document 11: Tara Kirk: In the 2004 Summer Olympics in Athens, Tara won a silver medal by swimming for the second-place American team in the preliminary heats of the women's 4×100-meter medley relay. Tara Kirk's younger sister, Dana Kirk, joined her on the 2004 USA Women's Olympic Swimming team, becoming the first set of sisters to swim on the same US Olympic Team.
Document 12: Puerto Rico: Originally populated by the indigenous Taíno people, the island was claimed in 1493 by Christopher Columbus for Spain during his second voyage. Later it endured invasion attempts from the French, Dutch, and British. Four centuries of Spanish colonial government influenced the island's cultural landscapes with waves of African slaves, Canarian, and Andalusian settlers. In the Spanish Empire, Puerto Rico played a secondary, but strategic role when compared to wealthier colonies like Peru and the mainland parts of New Spain. Spain's distant administrative control continued up to the end of the 19th century, helping to produce a distinctive creole Hispanic culture and language that combined elements from the Native Americans, Africans, and Iberians. In 1898, following the Spanish -- American War, the United States acquired Puerto Rico under the terms of the Treaty of Paris.
Document 13: Li Xuanxu: Li Xuanxu (; born February 5, 1994 in Zhuzhou, Hunan) is a female Chinese swimmer, who competed for Team China at the 2008 Summer Olympics. At the 2012 Summer Olympics she qualified in second place in the heats with a time of 4:34.28 in the Women's 400 metre individual medley. She won the Bronze medal in the final with 4:32.91.
Document 14: Kristina Lennox-Silva: Kristina Lennox-Silva (born April 24, 1985 in Fort Lauderdale, Florida) is a female freestyle and butterfly swimmer from Puerto Rico, who was born in the United States. During her college career she swam for Villanova University and was a multiple time Big East finalist as well earning her All-Big East status. She represented Puerto Rico at the 2008 Summer Olympics in Beijing, China and 2009 World Aquatics Championships in Rome, Italy. She is the sister of Douglas Lennox-Silva, who also competed as a swimmer at the 2008 Summer Olympics and 2009 World Championships.
Document 15: 51st state: Puerto Rico has been under U.S. sovereignty for over a century when it was ceded to the U.S. by Spain following the end of the Spanish–American War, and Puerto Ricans have been U.S. citizens since 1917. The island's ultimate status has not been determined as of 2012[update], its residents do not have voting representation in their federal government. Puerto Rico has limited representation in the U.S. Congress in the form of a Resident Commissioner, a delegate with limited no voting rights. Like the states, Puerto Rico has self-rule, a republican form of government organized pursuant to a constitution adopted by its people, and a bill of rights.
ground_truth: 1898
sub_queries: Kristina Lennox-Silva >> country of citizenship Answer: Puerto Rico
when was Puerto Rico declared a us territory Answer: 1898