Why was the Line of Demarcation established near the 38th parallel?

The Line of Demarcation was established near the 38th parallel following World War II to divide Korea into two occupation zones, primarily as a response to the geopolitical context of the Cold War. The United States and the Soviet Union agreed on this division during the Potsdam Conference, with the North being occupied by the Soviet Union and the South by the United States. This division aimed to manage the post-war reconstruction and prevent the spread of communism, ultimately leading to the establishment of two separate governments and escalating tensions between the two regions.