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Bonanza, American television series that ran on NBC from 1959 to 1973. Bonanza’s 14 seasons and 440 episodes made it the second-longest-running western in broadcast history, after Gunsmoke. Bonanza, the first western broadcast in colour, recounted the story of the Cartwrights, a fictional family of ranchers living in the mid-1800s, near Virginia City, Nevada, an actual mining boomtown. The Cartwrights were an all-male family headed by Ben (played by Lorne Greene), thrice a widower with...