system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How did North Korea become the dictatorship it is today?
gpt
After the fall of Nazi Germany the USSR began a military campaign against Japan (the last remaining Axis power).

Soviet military forces seized Pyongyang and Kim Il-sung was installed as the leader of the Communist party.

North Korea declared itself a sovereign entity in 1948 and has been a dictatorship ever since.