Question: When did the operator of SS Tropic go out of business?

full_context: Document 1: SS Nomadic (1891): SS "Nomadic" was a steamship of the White Star Line. She was laid down in 1891, in yard 236 at Harland and Wolff Shipyards, Belfast, as a livestock carrier and completed on 14 April 1891.
Document 2: White Star Line: White Star Line Former type Partnership Industry Shipping, transportation Fate merged with Cunard Line Successor Cunard White Star Line Founded 1845 (1845) in Liverpool, England Defunct 1934 Area served Transatlantic Parent Ismay, Imrie and Co. Website www.cunard.co.uk
Document 3: Saint Helena: From 1958, the Union Castle shipping line gradually reduced its service calls to the island. Curnow Shipping, based in Avonmouth, replaced the Union-Castle Line mailship service in 1977, using the RMS (Royal Mail Ship) St Helena.
Document 4: SS Tropic (1871): SS "Tropic" was a steamship operated by the White Star Line. Built in 1871 by shipbuilders Thos. Royden & Co, the 2,122 gross-ton vessel operated on the Liverpool to Calcutta run in 1871, and in 1872 began serving South American ports from Liverpool. In 1873, the ship was sold to Serra y Font, Bilbao, and renamed "Federico".
Document 5: Sealink: As demand for international rail travel declined and the shipping business became almost exclusively dependent on passenger and freight vehicle traffic, the ferry business was incorporated as Sealink UK Limited on 1 January 1979, a wholly owned subsidiary of the British Railways Board (BRB), but still part of the Sealink consortium. In 1979, Sealink acquired Manx Line which offered services to the Isle of Man from Heysham.
Document 6: Oceanic (unfinished ship): The RMMV "Oceanic" (Royal Mail Motor Vessel) was the planned name of an unfinished ocean liner that was partially built by Harland and Wolff for the White Star Line. The ship was to have been the first -long ocean liner. It was intended to be the largest ocean liner for the White Star Line, thus it would have been larger than the earlier White Star giants, "Olympic", "Titanic", "Britannic", and "Majestic."
Document 7: SS Cymric: SS "Cymric" was a steamship of the White Star Line built by Harland and Wolff in Belfast and launched on 12 October 1897. She had originally been designed as a combination passenger liner and livestock carrier, with accommodations for only First Class passengers. During the stages of her design layout, it became clearer to the designers at Harland and Wolff that combining passengers and livestock had become rather unpopular, so the spaces designated for cattle were reconfigured into Third Class accommodations. She departed Liverpool on her maiden voyage on 29 April 1898, arriving in New York City on 9 May 1898. She spent the first five years of her career on the White Star Line's main passenger service route between Liverpool and New York, until 1903 when she was transferred to the less traveled Liverpool-Boston route, which she sailed on for nine years before being returned to the New York route in 1912.
Document 8: RMS Celtic (1901): RMS "Celtic" was an ocean liner owned by the White Star Line. The first ship larger than the in gross tonnage (it was also longer), Celtic was the first of a quartet of ships over 20,000 tons, dubbed The Big Four.
Document 9: SS Suevic: SS "Suevic" was a steamship built by Harland and Wolff in Belfast for the White Star Line. "Suevic" was the fifth and last of the "Jubilee Class" ocean liners, built specifically to service the Liverpool-Cape Town-Sydney route, along with her sister ship "SS Runic". In 1907 she was wrecked off the south coast of England, but in the largest rescue of its kind, all passengers and crew were saved. The ship herself was deliberately broken in two, and a new bow was attached to the salvaged stern portion. Later serving as a Norwegian whaling factory ship carrying the name "Skytteren", she was scuttled off the Swedish coast in 1942 to prevent her capture by ships of Nazi Germany.
Document 10: SS Britannic (1874): "Britannic" was a single-screw passenger steamship equipped with sails built for the White Star Line's North Atlantic run. It was initially to be called "Hellenic", but, just prior to her launch, her name was changed to "Britannic". Together with her sister "Germanic", "Britannic" sailed for nearly thirty years, primarily carrying immigrant passengers on the highly trafficked Liverpool to New York City route. In 1876 it received the Blue Riband, both westbound and eastbound, by averaging almost .
Document 11: SS Baltic (1871): SS "Baltic" was an ocean liner owned and operated by the White Star Line. "Baltic" was one of the first four ships ordered by White Star from shipbuilders Harland and Wolff after Thomas Ismay bought the company, and the third of the ships to be delivered.
Document 12: American Export-Isbrandtsen Lines: American Export-Isbrandtsen Lines, New York, was the leading US-flag shipping company between the U.S. east coast and the Mediterranean from 1919 to 1977, offering both cargo ship services and passenger ship services, until it declared bankruptcy and was acquired by Farrell Lines, New York.
Document 13: SS Ionic (1883): SS "Ionic was a cargo liner initially in service with White Star Line from 1883 until 1900. She was used on the company's joint route to New Zealand with the Shaw, Savill & Albion Line. She was sold to the Aberdeen Line in 1900 and renamed SS "Sophocles, and was withdrawn for service in 1906 and scrapped in 1908.
Document 14: RMS Oceanic (1870): RMS "Oceanic" was the White Star Line's first liner and an important turning point in passenger liner design. Entering service in 1871 for Atlantic crossings, she was later chartered to Occidental and Oriental Steamship Company (O&O) in 1875. The ship provided passenger service for O&O in the Pacific until 1895 when she was sold for scrap.
Document 15: Williams & Guion Black Star Line: The Black Star Line was the name used by American sailing packets owned by the New York firm of Williams and Guion from 1848 to 1866. The line owned 18 ships on the Liverpool-Queenstown-New York route. The line was shut down in 1863 because of the success of newer, faster liners and the danger of transatlantic travel during the American Civil War.
ground_truth: 1934
sub_queries: SS Tropic >> operator Answer: White Star Line
when did White Star Line go out of business Answer: 1934