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The majority of outlaws in the Old West preyed on banks, trains, and stagecoaches. Some crimes were carried out by Mexicans and Native Americans against white citizens+ who were targets of opportunity along the U.S.–Mexico border, particularly in Texas, New Mexico, Arizona, and California. For example, Pancho Villa+ was a bandit+ from Durango+, Mexico+ who also conducted cross-border raids into New Mexico and Texas. Some individuals, like Jesse James+, became outlaws after serving in the Civil War+ and others were simply men who took advantage of the wildness and lawlessness of the frontier to enrich themselves at the expense of others. Some outlaws migrated to the frontier to escape prosecution for crimes elsewhere.
Law was present if spread thin in the American Old West. It was usually present on three levels: the Deputy U.S. Marshal+, the county sheriff+, and the town marshal or constable+. Sometimes their jurisdictions overlapped which could lead to conflicts+ like those between Deputy U.S. Marshal Virgil Earp+ and Cochise County, Arizona+ Sheriff Johnny Behan+. When an outlaw committed a crime, the local sheriff or marshal would usually form a posse+ to attempt to capture them. Rewards were posted for outlaws which encouraged citizens to capture or kill them for the reward, leading to the profession of bounty hunter+.