It had all the trappings of a down-home country fair somewhere well below the Mason-Dixon line: Lynyrd Skynyrd medleys, mile-long lines for fried chicken, barbecue and draft beer, and a plethora of Confederate flags emblazoning everything from belt buckles to motorcycle vests to trucker caps. But Sunday's party marking the 150th anniversary of the end of the American Civil War took about 5,000 miles (8,000 kilometers) south of the South, in a rural Brazilian town colonized by families fleeing Reconstruction. Thousands turn out every year, including many who trace their ancestry back to the dozens of families who, enticed by...