Latin American Presidents (L-R) Peru's Ollanta Humala, Chile's Sebatian Pinera, Colombia's Juan Manuel Santos and Mexico's Enrique Pena Nieto display their signed agreement on an economic investment protocol, in the historic city of Cartagena Feb 10, 2014. Presidents of Colombia, Chile, Peru and Mexico are attending the 8th Pacific Alliance Summit in this Caribbean port. Costa Rica was elected as a new member today. [Photo/Agencies]