Question: When did the country which contains the backlot Cinevilla become part of the soviet union?

full_context: Document 1: Cinevilla: Cinevilla is a backlot in the Tukums Municipality in Slampe parish, Latvia, and was created for the outdoor shootings of the feature film "Defenders of Riga". It is the only backlot in Latvia, and consists of replicas of historical buildings and constructions of Riga, the capital of Latvia. The backlot has a small canal to resemble the Daugava river quays of the Riga old town. The Stone Bridge is also there as well as the historical Lübeck and Pontoon bridges.
Document 2: Post-Soviet states: The post-Soviet states, also collectively known as the former Soviet Union (FSU) or former Soviet Republics, are the 15 independent states that emerged from the Union of Soviet Socialist Republics in its dissolution in December 1991, with Russia internationally recognised as the successor state to the Soviet Union. On March 11, 1990, Lithuania was the first to declare its independence, with Estonia and Latvia following suit in August 1991. All three Baltic states claimed continuity from the original states that existed prior to their annexation by the Soviet Union in 1944 and were admitted to the United Nations on 17 September 1991. The remaining 12 republics all subsequently seceded. 12 of the 15 states, excluding the Baltic states, initially formed the CIS and most joined CSTO, while the Baltic states focused on European Union and NATO membership.
Document 3: Lithuanian Soviet Socialist Republic: The Lithuanian Soviet Socialist Republic (Lithuanian SSR; Lithuanian: Lietuvos Tarybų Socialistinė Respublika; Russian: Литовская Советская Социалистическая Республика, Litovskaya Sovetskaya Sotsialisticheskaya Respublika), also known as Soviet Lithuania or Lithuania was a republic of the Soviet Union. It existed from 1940 to 1990.
Document 4: Billion Dollar Brain: Location filming for "Billion Dollar Brain" took place in Helsinki and other parts of Finland, including Turku. The Riga scenes were filmed in Porvoo, also in Finland. Scenes involving "The Brain" were filmed in Honeywell facilities and featured a Honeywell 200 mini-computer. The remainder of the film was shot in the United Kingdom. Scenes on the ice were filmed on a disused airfield which was covered with a layer of salt. All other scenes were shot at Pinewood Studios, including the scene where Midwinter's convoy falls through the broken ice - this was done in a giant tank with slabs of polystyrene used to represent the ice itself. The large size of the tank was deemed necessary because of the decision to use real vehicles instead of miniatures.
Document 5: School of Young Geographers: It is located primarily in Riga, Latvia (Faculty of Geography and Earth Sciences of the University of Latvia, Alberta Street 10) with its subsidiary in Valmiera, Latvia (Vidzeme University College, Cēsu Street 4) - Vidzeme School of Young Geographers. For certain periods subsidiaries of the School have been run in other cities of Latvia: Liepāja, Jelgava, Ogre, Salaspils, Kuldīga.
Document 6: Dissolution of the Soviet Union: On June 14, 1987, about 5,000 people gathered again at Freedom Monument in Riga, and laid flowers to commemorate the anniversary of Stalin's mass deportation of Latvians in 1941. This was the first large demonstration in the Baltic republics to commemorate the anniversary of an event contrary to official Soviet history. The authorities did not crack down on demonstrators, which encouraged more and larger demonstrations throughout the Baltic States. The next major anniversary after the August 23 Molotov Pact demonstration was on November 18, the date of Latvia’s independence in 1918. On November 18, 1987, hundreds of police and civilian militiamen cordoned off the central square to prevent any demonstration at Freedom Monument, but thousands lined the streets of Riga in silent protest regardless.
Document 7: Estonia: On 6 August 1940, Estonia was annexed by the Soviet Union as the Estonian SSR. The provisions in the Estonian constitution requiring a popular referendum to decide on joining a supra-national body were ignored. Instead the vote to join the Soviet Union was taken by those elected in the elections held the previous month. Additionally those who had failed to do their "political duty" of voting Estonia into the USSR, specifically those who had failed to have their passports stamped for voting, were condemned to death by Soviet tribunals. The repressions followed with the mass deportations carried out by the Soviets in Estonia on 14 June 1941. Many of the country's political and intellectual leaders were killed or deported to remote areas of the USSR by the Soviet authorities in 1940–1941. Repressive actions were also taken against thousands of ordinary people.
Document 8: Rēzekne Castle: Rēzekne Castle ruins are located in the centre of Rēzekne, Latvia, a city in the centre of Latgale. The castle served as a base of the local Livonian order landlords until the 16th century and also as the main military support base for battles against Russians and Lithuanians. Today, fragments of the stone walls and the foundation can be seen on the ancient castle hill.
Document 9: Wanted (2008 film): Location plate shooting took place in Chicago in April 2007. Several chase scenes, including one with a low flying helicopter, were shot in Chicago over two days, on Wacker Drive along the Chicago River, between Columbus Drive and LaSalle Street. The opening scene was filmed using the Carbide & Carbon Building. Production moved to the Czech Republic later in May, scheduled for 12 weeks of shooting, which included a scene in Pernštejn Castle. Using a former sugar factory in Prague, production designer John Myhre constructed a large textile factory as part of an industrial world, the setting of a mythological environment in which looms create fabrics that weavers interpret as assassination orders. Afterward, filming moved to Budapest, then returned to Chicago in August. While the actors performed many of their own stunts, with free running and parkour in some of the action scenes, and Angelina Jolie being actually strapped to the hood of a moving Dodge Viper, some of the especially high - risk sequences required digital doubles instead. Two full - sized train cars were built, a Chicago 'L' for a training scene where Fox and Wesley run atop a train, and a Czech Pendolino for the derailment, which was stationed in a gimbal equipped with hydraulics to allow the car to tilt and roll as the train crashed. The film originally had both an alternate opening and an alternate ending. The alternate opening, a flashback to ancient times describing the history of the Fraternity and the Loom of Fate, is available on the special edition DVD and Blu - ray.
Document 10: Estonia: In 1989, during the "Singing Revolution", in a landmark demonstration for more independence, more than two million people formed a human chain stretching through Lithuania, Latvia and Estonia, called the Baltic Way. All three nations had similar experiences of occupation and similar aspirations for regaining independence. The Estonian Sovereignty Declaration was issued on 16 November 1988. On 20 August 1991, Estonia declared formal independence during the Soviet military coup attempt in Moscow, reconstituting the pre-1940 state. The Soviet Union recognised the independence of Estonia on 6 September 1991. The first country to diplomatically recognise Estonia's reclaimed independence was Iceland. The last units of the Russian army left on 31 August 1994.
Document 11: Latvian Soviet Socialist Republic: Following the Welles Declaration of July 23, 1940, the annexation of Latvia into the Soviet Union (USSR) on 5 August 1940 was not recognized as legitimate by the United States, the European Community, and recognition of it as the nominal fifteenth constituent republic of the USSR was withheld for five decades. Its territory was subsequently conquered by Nazi Germany in June -- July 1941, before being retaken by the Soviets in 1944 -- 1945. Nevertheless, Latvia continued to exist as a de jure independent country with a number of countries continued to recognize Latvian diplomats and consuls who still functioned in the name of their former governments.
Document 12: Defenders of Riga: The outdoor scenes of the film were shot at the Cinevilla backlot in Tukums, Latvia, a backlot built especially for "Defenders of Riga".
Document 13: Mīlgrāvis: Mīlgrāvis is a neighbourhood of Northern District in Riga, the capital of Latvia. It is located on the western shore of Lake Ķīšezers.
Document 14: History of Latvia: The First Latvian National Awakening began in the 1850s and continued to bear fruit after World War I when, after two years of struggle in the Latvian War of Independence, Latvia finally won sovereign independence, as recognised by Soviet Russia in 1920 and by the international community in 1921. The Constitution of Latvia was adopted in 1922. Political instability and effects of the Great Depression led to the May 15, 1934 coup d'état by Prime Minister Kārlis Ulmanis. Latvia's independence was interrupted in June -- July 1940, when the country was occupied and incorporated into the Soviet Union. In 1941 it was invaded and occupied by Nazi Germany, then reconquered by the Soviets in 1944 -- 45.
Document 15: Molotov–Ribbentrop Pact: In mid-June 1940, when international attention was focused on the German invasion of France, Soviet NKVD troops raided border posts in Lithuania, Estonia and Latvia. State administrations were liquidated and replaced by Soviet cadres, in which 34,250 Latvians, 75,000 Lithuanians and almost 60,000 Estonians were deported or killed. Elections were held with single pro-Soviet candidates listed for many positions, with resulting peoples assemblies immediately requesting admission into the USSR, which was granted by the Soviet Union. The USSR annexed the whole of Lithuania, including the Scheschupe area, which was to be given to Germany.
ground_truth: 5 August 1940
sub_queries: Cinevilla >> country Answer: Latvia
when did Latvia become part of the soviet union Answer: 5 August 1940