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Lusitania, British ocean liner, the sinking of which by a German U-boat on May 7, 1915, contributed indirectly to the entry of the United States into World War I. The Lusitania, which was owned by the Cunard Line, was built to compete for the highly lucrative transatlantic passenger trade. Construction began in 1904, and, after completion of the hull and main superstructure, the Lusitania was launched on June 7, 1906. The liner was completed the...