This narrow strip of land - only 30 miles (48 km) wide at its narrowest point, and rarely wider than 75 miles (121 km) at any spot - contains one of the world's great engineering marvels: the Panama Canal, known to the world as "the path between the seas." Fees paid by the ships that pass through the canal make up a large part of Panama's economy. Panama's government has historically been democratic, holding fair elections for leaders, although corruption...