Lone Star Planet by H. Beam Piper [Revised Edition]

LONE STAR PLANET is the story of a junior diplomat and his first posting to a planet of Texans whose dinosaur-sized cattle have to be herded with tanks. The government of LONE STAR PLANET derives its character from H. L. Mencken's 1924 essay "The Malevolent Jobholder," -- a system under which the killing of a practicing politician is considered justifiable homicide! Offworld powers hope the diplomat will be assassinated, thereby creating a pretext for the invasion and subjugation of the independent LONE STAR PLANET.