Gauchos helped defeat Spanish troops and win independence in the 19th century, but the cowboys of lore are no match for today’s soybean boom and factory farms. “The classic gaucho is disappearing,” Lisandro Floral, a 30-year-old who manages a farm of 3,800 hectares (9,400 acres) deep in the Pampas, told AFP. Floral has forsaken the horse and the boleadoras — the traditional rope and leather ball sling used by gauchos to capture running cattle or game — in favor of a 4×4 equipped…