Mexican farm workers, or campesinos, have taken to the streets in recent weeks in fury over the idea of American chickens being divided and served in two different nations. As officials prepare to implement the next phase of the North American Free Trade Agreement (Nafta), Mexican farmers fear that lifting the 45 per cent tariff on poultry and a 2 to 20 per cent tariff on pork will wipe out domestic industries.The US penchant for chicken breasts leaves an excess of chicken legs and thighs that are expected to be sent across the border - at half the price...