Build a movie plot around this: What is Juan's nationality? Mexican.
A:
In Bridger's Wells, Nevada in 1885,[7] Art Croft (Harry Morgan) and Gil Carter (Henry Fonda) ride into town and enter Darby's Saloon. The atmosphere is subdued due to recent incidents of cattle-rustling. Art and Gil are suspected to be rustlers because they are rarely seen in town.A man enters the saloon and announces that a rancher named Larry Kinkaid has been murdered. The townspeople immediately form a posse to pursue the murderers, whom they believe are cattle rustlers. A judge tells the posse that it must bring the suspects back for trial, and that its formation by a deputy (the sheriff being out of town) is illegal. Art and Gil join the posse to avoid being its target. Davies (Harry Davenport), who was initially opposed to forming the posse, also joins, along with "Major" Tetley (Frank Conroy) and his son Gerald (William Eythe). Poncho informs the posse that three men and cattle bearing Kinkaid's brand have just entered Bridger's Pass.The posse encounters a stagecoach. When they try to stop it, the stagecoach guard assumes that it is a stickup, and shoots, wounding Art. In the coach are Rose Mapen (Mary Beth Hughes), Gil's ex-girlfriend, and her new husband, Swanson (George Meeker).Later that night in Ox-Bow Canyon, the posse finds three men sleeping, with what are presumed to be stolen cattle nearby. The posse interrogates them: a young, well-spoken man, Donald Martin (Dana Andrews); a Mexican, Juan Martinez (Anthony Quinn); and an old man, Alva Hardwicke (Francis Ford, brother of film director John Ford). Martin claims that he purchased the cattle from Kinkaid but received no bill of sale. No one believes Martin, and the posse decides to hang the three men at sunrise.Martin writes a letter to his wife and asks Davies, the only member of the posse that he trusts, to deliver it. Davies reads the letter, and, hoping to save Martin's life, shows it to the others. Davies believes that Martin is innocent and does not deserve to die.The Mexican "Juan", who is recognized as a gambler named Francisco...