Cartman joins the United States Border Patrol as a volunteer, where he is instructed to stop Mexicans from crossing the border, regardless of the "semantics" of which direction they are traveling.
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The boys play "Texans vs. Mexicans" at a sleepover at Cartman's house, a game in which the "Mexicans" (led at first by Butters, and then Kyle due to Butters' poor leadership skills) attempt to elude the "border patrol" (led by Cartman) and cross the border into Texas (Cartman's backyard).