Question: When did the country of origin of Wasana leave the British Empire?

full_context: Document 1: Andharangam: Andharangam is a Tamil language film, starring Kamal Haasan. Savithri and Major Sundarrajan played Deepa's parents. It was an adult rated movie, released when Kamal was in his early 20s. The movie was taken in black and white, but the song scene of ""Gnayiru Oli Mazhaiyil"", ""Paadaganai Thedikondu"" and ""Pudhu Mugame"" were taken in Gevacolor. The song "Gnayiru Oli Mazhaiyil" marked Kamal Haasan's debut as a singer. This film was a debut film for satheesh as a villain and also Deepa's debut film.
Document 2: Second Sirimavo Bandaranaike cabinet: The Second Sirimavo Bandaranaike cabinet was the central government of Ceylon led by Prime Minister Sirimavo Bandaranaike between 1970 and 1977. It was formed in May 1970 after the parliamentary election and it ended in July 1977 after the opposition's victory in the parliamentary election. The second Sirimavo Bandaranaike cabinet saw Ceylon severing the last colonial ties with Britain as the country became a parliamentary republic in May 1972. The country was also renamed Sri Lanka.
Document 3: Duhulu Malak: Duhulu Malak is a 1976 Sinhalese language romance film directed by Vijaya Dharmasri that follows the lives of middle-class people in Sri Lanka. The film stars Nita Fernando, Ravindra Randeniya and Tony Ranasinghe and is notable for containing the first depiction of adultery in a Sinhala film. As per some cinema analysts, the story of the film advises young people to be aware of their own attitudes, such as understanding, fairness and patience as they will lead them to a better married life.
Document 4: Wekande Walauwa: Wekande Walauwa (Mansion by the Lake) () is a 2002 award-winning Sinhalese language drama film directed by Lester James Peries and co-produced by Asoka Perera and Chandran Rutnam. It stars Malini Fonseka, Vasanthi Chathurani and Sanath Gunathilake in lead roles along with Paboda Sandeepani and Ravindra Randeniya. Music composed by Pradeep Ratnayake. It is the 1020th Sri Lankan film in the Sinhala cinema.
Document 5: Kaathirupaen Unakaaha: Kaathirupaen Unakaaha, (I will wait for you) is a romantic love story filmed in Sri Lanka in 1976 and released in 1977.
Document 6: Kitulgala: Kitulgala is a small town in the west of Sri Lanka. It is in the wet zone rain forest, which gets two monsoons each year, and is one of the wettest places in the country. Nevertheless, it comes alive in the first three months of the year, especially in February, the driest month. The Academy Award-winning "The Bridge on the River Kwai" was filmed on the Kelani River near Kitulgala, although nothing remains now except the concrete foundations for the bridge (and, supposedly, the submerged train cars that plunged into the river in the climactic scene). Kitulgala is also a base for white-water rafting, which starts a few kilometres upstream and also popular as a location for adventure based training programs.
Document 7: D. S. Senanayake: Don Stephen Senanayake (; ; 21 October 1883 – 22 March 1952) was a Sri Lankan statesmen. He was the first Prime Minister of Sri Lanka having emerged as the leader of the Sri Lankan independence movement that led to the establishment of self-rule in Sri Lanka. He is considered as the "Father of the Nation".
Document 8: Hanthane Kathawa: Hanthane Kathawa (Sinhalese language word means "Story of Hanthana") is a 1969 film based on a love story of university students of Sri Lanka. It was directed by famous Sri Lankan film director Sugathapala Senerath Yapa and screened on August 1, 1968. This film also remarks the cinema debut of famous actor Vijaya Kumaratunga.
Document 9: Wasana: Wasana is a 1976 Sinhalese language romance film directed that follows the lives of middle-class people in Sri Lanka. The film stars Geetha Kumarasinghe, Vijaya Kumaranatunga and Malini Fonseka made notable roles. Also this film was the cinema debut of popular Sri Lankan film actress Geetha Kumarasinghe.
Document 10: S. Mahinda: S. Mahinda arrived in Ceylon (now Sri Lanka) at a young age and was ordained as a Buddhist monk. Having learned the Sinhala language, he became a poet, creating several literary works inspiring patriotism among the Sinhalese and urging them to fight for their freedom during Sri Lankan Independence movement.. He is now considered a national hero of Sri Lanka and one among the greatest of Sinhalese poetry figures of all time.
Document 11: Suwanda Denuna Jeewithe: Suwanda Denuna Jeewithe (සුවඳ දැනුණා ජීවිතේ) is a 2010 Sinhala Romantic/Musical film written and directed by Dhammika Siriwardana. The film stars Roshan Ranawana as Ayeshmantha, Pooja Umashankar as Rashmi, Gayathri Dias, Ramani Siriwardana, Richard Manamudali, Rex Kodippily, Himali Siriwardana, Pubudu Chathuranga as Prasad, and Sanath Gunatilaka.
Document 12: Sri Lankan independence movement: The Sri Lankan independence movement was a peaceful political movement which aimed at achieving independence and self - rule for Sri Lanka, then Ceylon, from the British Empire. It was initiated around the turn of the 20th century and led mostly by the educated middle class. It succeeded when, on February 4, 1948, Ceylon was granted independence as the Dominion of Ceylon. Dominion status within the British Commonwealth was retained for the next 24 years until May 22, 1972 when it became a republic and was renamed the Republic of Sri Lanka.
Document 13: Dominion of Ceylon: Between 1948 and 1972, Ceylon was an independent country in the Commonwealth of Nations that shared a monarch with Australia, Canada, New Zealand and the United Kingdom, and certain other sovereign states. In 1948, the British Colony of Ceylon was granted independence as Ceylon. In 1972, the country became a republic within the Commonwealth, and its name was changed to Sri Lanka. It was an island country in South Asia, located about 31 kilometres (19.3 mi) off the southern coast of India.
Document 14: British Empire: Britain's remaining colonies in Africa, except for self-governing Southern Rhodesia, were all granted independence by 1968. British withdrawal from the southern and eastern parts of Africa was not a peaceful process. Kenyan independence was preceded by the eight-year Mau Mau Uprising. In Rhodesia, the 1965 Unilateral Declaration of Independence by the white minority resulted in a civil war that lasted until the Lancaster House Agreement of 1979, which set the terms for recognised independence in 1980, as the new nation of Zimbabwe.
Document 15: History of India: From 1920 leaders such as Mahatma Gandhi began highly popular mass movements to campaign against the British Raj using largely peaceful methods. The Gandhi-led independence movement opposed the British rule using non-violent methods like non-cooperation, civil disobedience and economic resistance. However, revolutionary activities against the British rule took place throughout the Indian subcontinent and some others adopted a militant approach like the Indian National Army that sought to overthrow British rule by armed struggle. The Government of India Act 1935 was a major success in this regard. All these movements succeeded in bringing independence to the new dominions of India and Pakistan on 15 August 1947.
ground_truth: February 4, 1948
sub_queries: What country did Wasana originate? Answer: Sri Lanka
when did Sri Lanka leave the british empire Answer: February 4, 1948