Piendamo, Colombia, Aug 1 (EFE).- Indigenous and Afro-Colombian peasants shut down the Panamericana highway Tuesday in this town in the southwest province of Cauca to dramatize their demands for land, homes, and infrastructure. Around 5,000 people used tractor-trailers, trees, and mounds of sand to block Colombia’s main north-south artery in Piendamo, according to the organizers, …