The Demilitarization zone set up at the 38th parallel in between the Korea's was a few miles long, and contained military installations from both sides to deter each other from striking each other. This followed the U.S.'s policy of containing the spread of Communism, and they were successful in doing so.
The Demilitarized Zone of Korea consists of a four meter electric fence with barbed wire on top, which spreads for 280 kilometers from east to west, following the summits and then descending to the valleys, covering the entire land section of the peninsula. Further on, two kilometers away, the demarcation line runs. On both sides of the DMZ are bunkers, artillery pieces and two armies in a state of constant attention. A peculiarity of this set is the presence of huge loudspeakers installed by the government of South Korea in 11 points along the Demilitarized Zone, and that emit messages calling on the North Koreans to rebel against the regime of the north, which in turn or another one fires at the devices trying to silence it
The Han Dynasty in China, one of the world's great classical civilizations, because people rebelled against them. How did mountains and deserts help Chinese civilizations develop? Mountain and deserts helped the Chinese by giving the safe borders.